Providing online graphical data flow web application tools or services for charge

ABSTRACT

System and method for performing program-related operations over a network via a web browser. A network connection is established between a server computer and a client computer over a network. A universal resource identifier (URI) is sent from the client computer to the server computer over the network, where the URI indicates a program, e.g., a graphical program (GP), or at least a portion of a graphical program interactive development environment (GPIDE), e.g., a graphical program editor, an execution engine, a static or dynamic analyzer, and/or compiler. The at least a portion of the GPIDE is received from the server computer over the network in response to the URI, and executed in a web browser of the client computer to perform some specified functionality with respect to the GP.

PRIORITY DATA

This application claims benefit of priority to U.S. ProvisionalApplication Ser. No. 61/179,282, titled “Graphical Data Flow ProgramOperations in a Browser”, filed May 18, 2009, whose inventors were PaulF. Austin, Ramprasad Kudukoli, and Diya Mukherji, and further claimsbenefit of priority to U.S. Provisional Application Ser. No. 61/230,947,titled “Graphical Data Flow Program Operations in a Web Browser”, filedAug. 3, 2009, whose inventors were Paul F. Austin, Ramprasad Kudukoli,Christopher G. Cifra, Brock J. Reeve, Malcolm I. Smith, Mohammed KamranShah, John D. Stanhope, and Duncan G. Hudson III, both of which arehereby incorporated by reference in their entirety as though fully andcompletely set forth herein.

FIELD OF THE INVENTION

The present invention relates to the field of programming, and moreparticularly to a system and method for performing graphical or dataflow program related operations in a web browser.

DESCRIPTION OF THE RELATED ART

Data flow programming is a programming approach or protocol with manyindustrial (and other) applications. In data flow (or dataflow)programming, the program architecture is that of a directed graphspecifying the flow of data through the program. In data flow programsfunctions execute whenever the necessary input data are available. Dataflow programs can be contrasted with procedural programs, which specifyan execution flow of computations to be performed.

Graphical programming has become a powerful tool available toprogrammers. Graphical programming environments such as NationalInstruments Corporation's LabVIEW product have become very popular.Tools such as LabVIEW have greatly increased the productivity ofprogrammers, and increasing numbers of programmers are using graphicalprogramming environments to develop their software applications. Inparticular, graphical programming tools are being used for test andmeasurement, data acquisition, process control, man machine interface(MMI), supervisory control and data acquisition (SCADA) applications,modeling, simulation, image processing/machine vision applications, andmotion control, among others.

Graphical data flow programs or diagrams, such as LabVIEW, combine theabove two paradigms. A graphical program or diagram includes a pluralityof interconnected nodes (or blocks), where at least a subset of theconnections among the nodes visually indicate that data produced by onenode is used by another node. A LabVIEW virtual instrument (VI) is oneexample of a graphical data flow program; a Simulink block diagram isanother example of a graphical data flow program.

The development of the Internet and the World Wide Web (WWW) hasextended communication capabilities in virtually all areas of societyand the economy, generating significant opportunities for innovation inmany fields, including industrial design, measurement, automation, andcontrol, among others.

SUMMARY OF THE INVENTION

Various embodiments of a system and method for performing programoperations, e.g., graphical data flow program operations, over a networkvia a web browser are presented below. Note that in various embodiments,any of the features and techniques disclosed herein may be used withrespect to any of the methods described herein.

In one embodiment, a network connection may be established between aclient computer and a server computer over a network. For example, auser may open a web browser on the client computer and direct thebrowser to the server computer.

A universal resource identifier (URI) may be sent from the clientcomputer to the server computer over the network, where the URIindicates a graphical data flow program (GDFP) or a graphical data flowprogram editor (GDFP editor) for creating or editing the GDFP. Note thatin some embodiments, these steps may be performed together. For example,the user of the client computer may click on a link or may otherwiseindicate the URI, which may automatically invoke the connection with theserver computer.

The GDFP editor may be sent from the server computer to the clientcomputer, i.e., may be received by the client computer from the servercomputer over the network in response to the URI. In one embodiment, theGDFP is a pre-existing GDFP, where the GDFP editor is associated withthe pre-existing GDFP, and where the URI specifies the pre-existingGDFP, thereby also indicating the associated GDFP editor. In thisembodiment, the GDFP may also be received from the server computer inresponse to the URI. Alternatively, in embodiments where the GDFP is nota pre-existing GDFP, the URI may specify the GDFP editor, and the GDFPeditor may be executable in the web browser to receive user inputspecifying creation of the GDFP, and create the GDFP in response to theuser input.

The GDFP editor may be executed in a web browser. In some embodiments,the GDFP editor may be configured to execute in a sandbox, where thesandbox is or includes a secure execution environment for the GDFPeditor. Thus, executing the GDFP editor in the web browser may includeexecuting the GDFP editor in the sandbox. Note that the sandbox may beimplemented in any of a variety of ways. For example, in one embodiment,the sandbox may be implemented by a plugin, and so executing the GDFPeditor in the sandbox may include executing the GDFP editor in theplugin.

The GDFP may be displayed in the web browser, where the GDFP includes aplurality of interconnected nodes or icons which visually indicate thefunctionality of the program. User input may be received to the GDFPeditor executing in the web browser, where the user input indicates oneor more edit operations to be performed on the GDFP, and the GDFP may beedited in the web browser via the GDFP editor in accordance with the oneor more edit operations, thereby generating an edited GDFP. For example,the user may “drag and drop” various graphical function nodes onto ablock diagram and “wire” the nodes together. The edited GDFP may bedisplayed in the web browser, e.g., an edited block diagram of the GDFPmay be displayed. Displaying the edited block diagram in the web browsermay include displaying edited block diagram in a GUI presented in theweb browser, e.g., an editor window.

In another embodiment, instead of a GDFP editor, the universal resourceidentifier (URI) may indicate a GDFP execution engine for executing theGDFP. In other words, the GDFP may require the GDFP execution engine toexecute.

Thus, the GDFP execution engine (which may include a GDFP editor) may bereceived by the client computer from the server computer over thenetwork in response to the URI.

The GDFP may be executed in a web browser via the GDFP execution engine.In other words, the GDFP execution engine may execute the GDFP withinthe web browser. In one embodiment, the method may include receivinguser input to the web browser invoking execution of the GDFP, and theGDFP may be executed in the browser in response to the received userinput.

In one embodiment, e.g., where the GDFP is not pre-existing, and theuser creates the program, the method may include sending the (created)GDFP to the server computer for compilation, and receiving an executablefor the GDFP from the server computer (e.g., generated via compilationon the server computer). Thus, after compilation, the server may sendthe resulting executable back for execution, e.g., at the request of theuser via the web browser, or automatically. Alternatively, the GDFPexecution engine may further include a compiler, e.g., as part of a GDFPdevelopment environment downloaded with the GDFP execution engine, andthe GDFP (in the form of graphical source code) may be compiled tocreate the executable. Thus, executing the GDFP in the web browser mayinclude the GDFP execution engine executing the executable of the GDFPin the web browser. Alternatively, the GDFP execution engine may be orinclude an interpreter, and so executing the GDFP may includeinterpreting the (graphical source code of) the GDFP. This feature mayalso be applied to any of the other methods disclosed herein, asdesired.

An indication of executing the GDFP may be displayed in the web browser.For example, output from the program may be displayed in the webbrowser, e.g., in a GUI, e.g., front panel, of the GDFP. More generally,a graphical user interface (GUI) of the GDFP may be displayed in the webbrowser on a display, where the GUI may be configured to display resultsof the GDFP execution, or receive user input specifying input to theGDFP.

Some client systems may not have the capability to execute the GDFP,e.g., may not include software that supports or includes theabove-mentioned sandbox or plugin, e.g., may not be capable of executingthe GDFP execution engine; but there still may be a need or desire toview such graphical programs. For example, client users may wish to viewthe above edited GDFP, even though they cannot execute it. Thus, in oneembodiment, the GDFP may have an associated representation implementedin a browser supported format, e.g., one or more of: HTML an imageformat, or PDF, among other browser supported/accessible formats, wherethe representation of the GDFP does not include the GDFP. In otherwords, the server may store not only the GDFP, but also may store adownloadable representation of the GDFP that may be viewable in a webbrowser. Thus, the representation of the GDFP may be downloadable toclient systems for display in browsers on the client systems, includingbrowsers that do not support execution of the GDFP. Moreover, therepresentation of the GDFP may be indexable for searching by searchengines, and so may be findable via web search technologies. In variousembodiments, the representation of the GDFP may include one or more ofcomments in the GDFP, an indication of components referenced by the GDFPwith links to the referenced components, or notes regarding the GDFP,among other items, e.g., metadata related to the program.

Accordingly, in some embodiments where the GDFP is edited andtransmitted back to the server, the method may further include receivingthe edited GDFP from the client system, and generating and storing suchan associated representation of the edited GDFP, i.e., where therepresentation of the edited GDFP does not include the edited GDFP, andwhere the representation of the GDFP is downloadable to client systemsfor display in browsers on the client systems, including browsers thatdo not support execution of the edited GDFP.

In another embodiment, the URI may indicate a graphical program (GP) ora graphical program analyzer or debugger for analyzing GPs, which insome embodiments may be or include an editor (GP editor) for creating,editing, and analyzing the GP. The GP analyzer may be received by theclient computer from the server computer over the network in response tothe URI. The GP may be a pre-existing GP, where the GP analyzer isassociated with the pre-existing GP, and where the URI specifies thepre-existing GP, thereby also indicating the associated GP analyzer. Inthis embodiment, the GP may also be received from the server computer inresponse to the URI. Alternatively, in embodiments where the GP is not apre-existing GP, the URI may specify the GP analyzer, which, asindicated above, may be or include a GP editor, and the GP analyzer maybe executable in the web browser to receive user input specifyingcreation of the GP, and create and edit the GP in response to the userinput.

The GP analyzer may be executed in a web browser, e.g., in a sandbox,i.e., a secure execution environment, possibly implemented as a plugin.Executing the GP analyzer in the web browser may thus occur in thesandbox, thus preventing interference from or interfering with otherprograms executing on the (client) computer. Note that in someembodiments, the analyzer may be executed within the web browser as partof editor functionality, e.g., as part of the editing or developmentprocess.

The GP may be displayed in the web browser, e.g., via the GP analyzer,where the GP comprises a plurality of interconnected nodes or iconswhich visually indicate the functionality of the program. For example, aGUI, e.g., a window, may be displayed in the web browser, and the GP maybe displayed in the GUI. In some embodiments, the graphical program maybe or include a graphical data flow program (GDFP), i.e., may have anarchitecture and behavior in accordance with a data flow model ofcomputation. Accordingly, in such embodiments, the analyzer may be orinclude a graphical data flow program analyzer (and/or editor).

The GP may be analyzed in the web browser via the GP analyzer, andresults of analyzing the GP may be displayed in the web browser. Forexample, the GP analyzer may analyze the GP graphical source code,including, for example, performing type propagation in the GP, orconstant folding in the GP, among other aspects of the GP graphicalsource code. Similar to the display of the GP itself, the analysisresults may be displayed in a GUI, e.g., a window, in the web browser.In various embodiments, the results of analyzing the GP may be storedlocally, and/or may be sent to the server or another device over thenetwork for storage, analysis, or use by other users.

Note that the analysis referred to is static analysis, e.g., performedat edit and/or compile time. In other words, the analysis may beperformed on or with respect to the source code of the GP, not withrespect to its behavior during execution, referred to as dynamicanalysis, which is discussed below.

In a further embodiment, the URI may indicate a GP execution engine forexecuting and analyzing the (executing) GP, i.e., dynamically. In otherwords, the GP may require the GP execution engine to execute, and may bedynamically analyzed via the GP execution engine. Thus, the GP executionengine may be or include a GP dynamic analyzer. As with the abovemethod, the GP may include a plurality of interconnected nodes thatvisually indicate functionality of the program, and in some embodiments,may be or include a graphical data flow program, i.e., may have anarchitecture and behavior in accordance with a data flow model ofcomputation, although any other types of graphical programs may be usedas desired.

The GP execution engine may be received from the server computer overthe network in response to the URI. If the GP is a pre-existing GP, theURI may specify the pre-existing GP, thereby also indicating theassociated GP execution engine, where, for example, the GP may also bereceived from the server computer in response to the URI, oralternatively, if the GP is not a pre-existing GP, the URI may specifythe GP execution engine, and the GP execution engine may be executablein the web browser to receive user input specifying creation of the GP,and create (and edit) the GP in response to the user input, i.e., theexecution engine may include or be associated with a GP editor (and insome embodiments, a GP compiler or interpreter).

The GP may be executed and dynamically analyzed in a web browser via theGP execution engine, i.e., the GP execution engine may analyze the GPduring execution. In other words, the GP execution engine may executethe GP within the web browser, and analyze the GP during execution,e.g., dynamically. Analyzing the GP during execution may includeanalyzing one or more of: performance of the executing GP, usability ofthe executing GP, or execution speed of the GP, among other aspects ofthe GP execution. In one embodiment, the method may include receivinguser input to the web browser invoking execution of the GP, and the GPmay be executed and dynamically analyzed in the browser in response tothe received user input.

Results of analyzing the GP may be displayed in the web browser. Forexample, output from dynamically analyzing the program may be displayedin a GUI displayed in the web browser. The analysis results may bestored locally, and/or may be transmitted back to the server (or anotherdevice) for storage and/or provision to the other client computers.

In one embodiment, the created GP may be sent to the server computerover the network for compilation, i.e., the server computer may receivethe created GP from the client computer over the network, and maycompile the GP to generate an executable of the GP, which may be sent tothe client computer over the network. In another embodiment, the GPexecution engine may include a compiler that is executable in the webbrowser to compile the created GP in the web browser (on the clientcomputer), thereby generating an executable of the created GP, where theGP execution engine being executable in the web browser to execute theGP includes the GP execution engine being executable in the web browserto execute the executable of the created GP. Alternatively, in someembodiments, the GPDE or GP execution engine is or includes aninterpreter, and executing the GP (and/or the edited GP) in the webbrowser includes the GP execution engine interpreting the GP (and/or theedited GP).

In a more general embodiment, the URI may indicate a program or anintegrated development environment (IDE). The IDE may be received fromthe server computer over the network in response to the URI. The IDE maybe executable in a web browser to create, edit, compile, execute, anddebug (and possibly optimize) programs in the web browser, via any ofthe techniques described herein, as applied more generally to programsthat may textual, graphical, data flow, and/or graphical data flowprograms, as desired. Thus, in some embodiments, the program may be orinclude a graphical program (GP), and the IDE may be or include agraphical program development environment (GPDE). In other embodiments,the graphical program may be or include a graphical data flow program(GDFP), and the IDE may be a graphical data flow program developmentenvironment (GDFPDE). The IDE may include an editor, edit-time analyzer,compiler, interpreter, execution engine, and/or dynamicanalyzer/debugger, and thus, may be referred to as an editor, a staticanalyzer, a compiler, interpreter, an execution engine, and/or a dynamicanalyzer or debugger, depending on the functionality being considered.In some embodiments, the IDE may be further executable to automaticallyparallelize one or more portions of the graphical program in response toanalyzing the program, and/or otherwise optimize the program.

Various of the techniques disclosed herein may also be utilized withrespect to embedded devices.

For example, in one embodiment, a network connection may be establishedbetween a client computer and an embedded device over a network via auniversal resource identifier (URI) associated with the embedded device,e.g., a user may open a web browser and direct the browser to theembedded device. The embedded device may store a graphical program (GP)and a graphical program execution engine (GPEE), where the GP requiresthe GPEE to execute.

In one embodiment, the URI specifies the GP, thereby also indicating theassociated GPEE, while in another embodiment, the URI specifies theGPEE, and the associated GP is automatically indicated as a result. Inyet another embodiment, the URI may simply specify the embedded device,and the GPEE and associated GP are automatically indicated via theirassociation with the embedded device.

The embedded device may include a web server, e.g., may be configured tostore and serve web pages and/or other web content over a network. Theembedded device may include limited display capabilities, or may noteven include a display, i.e., may be “headless”, in that the device maynot include a monitor or other display capabilities.

As noted above, the GP may include a plurality of interconnected nodesthat visually indicate functionality of the program, and in someembodiments, the graphical program may be or include a graphical dataflow program (GDFP), and the GP execution engine may be or include agraphical data flow program execution engine (GDFPEE), or a graphicaldata flow development environment (GDFE). More generally, in someembodiments, the GP execution engine may be or be included in aninteractive development environment (IDE), which may be executable inthe web browser to create, edit, analyze/debug, compile or interpret,optimize, and/or execute the GP. The GP execution engine and the GP maybe received from the embedded device over the network in response to theURI.

The GP may be executed in a web browser via the GP execution engine tocontrol the embedded device in response to user input to the GPexecuting in the web browser, or to monitor activity or performance ofthe embedded device, including analyzing and displaying output from theembedded device in the web browser, e.g., in a GUI displayed in the webbrowser. As with the above methods, the GP execution engine may beconfigured to execute in a sandbox. User input may be received to the GPexecuting in the web browser to control the embedded device, and inresponse, the GP may be executable to send commands to the embeddeddevice over the network in response to the user input. In correspondencewith the client computer sending commands to the embedded device overthe network in response to the user input to control the embeddeddevice, the method may include (the embedded device) receiving thecommands, and configuring the embedded device to operate in accordancewith the commands.

In a further embodiment directed to embedded devices, the embeddeddevice may store a graphical program (GP) and a graphical programeditor/execution engine (GPEEE). The embedded device may be or include aweb server, e.g., may be configured to store and serve web pages and/orother web content over a network, and may store a graphical program(GP), e.g., an embedded device application, that the embedded deviceexecutes to perform one or more functions, as well as a graphicalprogram editor/execution engine (GPEEE). In other words, the GP mayrequire the GPEEE to execute, and may also be edited in the GPEEE. Invarious embodiments, the embedded device may be configured to executethe GP to perform a measurement task, a control task, a simulation task,or an automation task, among others.

The GPEEE and the GP may be received from the embedded device over thenetwork in response to the URI, and the GPEEE may be executed within theweb browser to display the GP in the web browser, receive user inputindicating one or more edit operations to be performed on the GP, editthe GP in the web browser in accordance with the one or more editoperations, thereby generating an edited GP, display the edited GPsource code in the web browser, and compile or interpret, execute,and/or debug (and possibly optimize) the edited GP.

Moreover, in some embodiments, the method may also include deploying theedited GP to the embedded device, where the updated GP may be executable(which may include interpretation by an interpreter) by the embeddeddevice to perform updated one or more functions. Thus, the applicationon the embedded device may be updated by the client computer via a webbrowser.

In one embodiment, a network connection may be established between aclient computer and a device, e.g., a server computer, where the device(e.g., server computer) stores a plurality of graphical data flowprograms (GDFPs), as well as a graphical data flow program executionengine (GDFP execution engine) required by the GDFPs to execute. Theserver computer may also store version histories of the GDFPs andcorresponding versions of the GDFPs. Note that the plurality of GPs mayinclude one or more of a measurement program, a control program, asimulation program, or an automation program, among others. However, itshould be noted that in other embodiments, any type of graphical dataflow programs may be stored as desired.

A universal resource identifier (URI) may be received by the servercomputer from the client computer over the network, where the URI mayindicate a GDFP of the plurality of GDFPs, and the GDFP and the GDFPexecution engine may be sent to the client computer over the network inresponse to the URI, where the GDFP execution engine may be executablein a web browser on the client system to execute the GDFP in the webbrowser, and display an indication of executing the GDFP in the webbrowser. Similar to the above methods, in some embodiments, the GDFPexecution engine may be configured to execute in a sandbox.

In some embodiments, the GDFP execution engine may include an editorthat executes in the web browser on the client computer to receive userinput editing the GDFP, thereby generating an edited GDFP, and displaythe edited GDFP in the web browser. Additionally, the method may includethe server computer receiving the edited GDFP from the client computerand storing the edited GDFP, where the edited GDFP is available fordownload by other users. The method may further include updating theversion history of the GDFP. Thus, in some embodiments, a (subsequent)user may access the server computer and download a specific version of aGP on the server, e.g., based on the version history.

Moreover, the editor may be executable in the web browser to receiveuser input specifying creation of a new GDFP, create the new GDFP inresponse to the user input, and display the new GDFP in the web browser,in which case, the method may also include receiving the new GDFP fromthe client computer and storing the new GDFP, e.g., for download byother users. The method may also include creating and storing a versionhistory of the new GDFP. Thus, new programs may be added to therepository.

In some embodiments, the GDFP execution engine may include a compilerthat is executable in the web browser to compile the edited GDFP,thereby generating an executable of the edited GP. The GP executionengine may then be executable in the web browser to execute theexecutable of the edited GP in the web browser.

Alternatively, in some embodiments, the GPDE or GP execution engine isor includes an interpreter, and executing the GP (and/or the edited GP)in the web browser includes the GP execution engine interpreting the GP(and/or the edited GP).

More generally, in some embodiments, the GDFP engine may be comprised inan interactive development environment (IDE) executable in the webbrowser to edit, analyze, compile, or interpret, the GDFP in the webbrowser.

In a further embodiment, a network connection may be established betweena device, e.g., a server computer, and each of a plurality of clientcomputers over a network. The server computer may store a plurality ofgraphical data flow programs, as well as a graphical data flow programexecution engine (GDFP execution engine) required by the GDFPs toexecute. In various embodiments, the plurality of GPs may include one ormore of a measurement program, a control program, a simulation program,or an automation program, although any other type of graphical programmay be included as desired.

A universal resource identifier (URI) may be received from each of theclient computers over the network, where the URI indicates a GDFP of theplurality of GDFPs, and the GDFP and the GDFP execution engine may besent to each client computer over the network in response to the URI. Asdescribed above, the GDFP execution engine may be configured to executein a sandbox, e.g., a secure execution environment, possibly implementedby a plugin. The GDFP execution engine (which may be or include aninterpreter) may be executable in a web browser on each client computerto execute the GDFP in the web browser, thereby generating executionresults, and to send the execution results for the GDFP over the networkto the server computer.

The execution results for the GDFP may be received by the servercomputer from each client computer over the network, and the receivedexecution results may be analyzed, thereby generating analysis results.In other words, the server computer may execute analysis software toanalyze the execution results for the GDFP from the plurality of clientcomputers. The analysis results may be stored, e.g., in a memory mediumof the server computer, or some other computer, e.g., a data repository.

In some embodiments, the analysis results may be sent to each clientcomputer over the network for display in the client computers' browsers.Accordingly, in some embodiments, the GDFP execution engine may executein the web browser of each client computer to receive the analysisresults over the network, and display the analysis results in the webbrowser.

The GDFP execution engine may be executable in the web browser todisplay a graphical user interface (GUI) in the web browser on adisplay, e.g., to display results of the GDFP execution, or receive userinput specifying input to the GDFP. In one embodiment, the GDFP may beembedded in a web page, where the URI references the web page, therebyindicating the GDFP, and where sending the GDFP execution engine to theclient computer over the network in response to the URI includes sendingthe web page to the client computer over the network, including the GDFPand the GDFP execution engine. Accordingly, executing the GDFP in a webbrowser may include the GDFP execution engine executing the GDFP in theweb page, in which case, GDFP execution engine may also display resultsof executing the GDFP in the web page on the display.

The above embodiments are described with respect to a single GDFP;however, the method is generally applicable to multiple client computersexecuting different GDFPs, as well. Thus, the multiple URIs may specifydifferent GDFPs, the same GDFPs, or any combination of the two. In otherwords, various of the client computers may specify different GDFPs viarespective URIs.

In another embodiment, a network connection may be established with aclient computer over a network, e.g., between the client computer and adevice, e.g., a server computer, where the server computer stores aplurality of graphical data flow programs (GDFPs), where each GDFPcomprises a respective plurality of interconnected nodes or icons whichvisually indicate the functionality of the program, as well as agraphical data flow program execution engine (GDFP execution engine)required by the GDFPs to execute. The server computer may also storespecification of intellectual property rights and licensing for each ofthe GDFPs. The plurality of GPs may include one or more of a measurementprogram, a control program, a simulation program, or an automationprogram, although any other type of graphical program may be included asdesired.

A universal resource identifier (URI) may be received by the servercomputer from the client computer over the network, where the URIindicates a graphical data flow program (GDFP) or a GDFP executionengine for executing the GDFP.

The specification of intellectual property rights and licensing for theGDFP may be analyzed. For example, the specification of intellectualproperty rights and licensing for the GDFP may be analyzed with respectto constraints regarding terms of use of the GDFP, e.g., who maydownload the program, whether the program may be edited, whether or howthe program may be used for commercial purposes, and so forth.

A determination may be made based on the analysis as to whether thespecification of intellectual property rights and licensing for the GDFPpermits sending the GDFP to the client computer. If the specification ofintellectual property rights and licensing for the GDFP permits, theGDFP may be sent to the client computer over the network in response tothe URI (and in accordance with the specification of intellectualproperty rights and licensing for the GDFP), where the GDFP executionengine may be executable in a web browser on the client system toexecute the GDFP in the web browser, and display an indication ofexecuting the GDFP in the web browser. For example, the GDFP executionengine may be executable in the web browser to display a GUI in the webbrowser on a display, where the GUI is configured to display results ofthe GDFP execution, or receive user input specifying input to the GDFP.

If, on the other hand, the specification of intellectual property rightsand licensing for the GDFP does not permit (the sending of the GDFP andthe GDFP execution engine), an indication to that effect may be sent tothe client computer over the network. In other words, the method mayindicate to the client computer that the specification of intellectualproperty rights and licensing for the GDFP does not permit sending theGDFP and the GDFP execution engine to the client computer, e.g., bysending a message for display on the client computer.

In one embodiment, graphical data flow programs and related tools may beprovided for charge. For example, the server computer may store aplurality of graphical data flow programs, e.g., web applications, andpossibly software tools, and so forth, where each GDFP is accessible anduseable via web browsers executing on client computers. The servercomputer may also store a GDFP execution engine, where the GDFPs requirethe GDFP execution engine to execute. Note that in other embodimentsonly one GDFP may be stored on the server computer.

The GDFPs may be of any type or functionality desired. For example, invarious embodiments, the GDFPs may include or be task or domain specificprograms or applications for industrial, scientific, or evenentertainment purposes, e.g., data analysis and processing, measurement,testing, control, or automation, among others. For example, the GDFP maybe or include a measurement application, where the measurementapplication is executable in the web browser on the client computer toperform a specified measurement function. In another embodiment, theGDFP may be a model of a hardware device, e.g., useable to observe ortest the functionality of the device without the device itself, where,for example, the model may “stand in” for the device during operation ofa system, e.g., a measurement system, e.g., to determine theappropriateness (or not) of the device for the system. In someembodiments, the model may be of a hardware system, e.g., that includesmultiple devices.

Thus, a universal resource identifier (URI) may be received from theclient computer over the network, where the URI indicates a GDFP of theplurality of GDFPs, and the GDFP and the GDFP execution engine may besent to the client computer over the network in response to the URI. TheGDFP execution engine may be executable in a web browser to execute theGDFP to perform the specified functionality of the GDFP.

A charge for use of the GDFP on the client computer may be assessed.Note that charging for use of the GDFP may be accomplished in any waydesired, e.g., charging a client account, charging/billing for asubscription service, charging/billing per use, e.g., “a la carte”, andso forth.

Other embodiments may be directed to web-based program development forparticular types of programs.

For example, in one embodiment, a universal resource identifier (URI)may be sent by a client computer to a server computer over the network,where the URI indicates a graphical program (GP) or at least a portionof an integrated development environment (IDE), which may be referred tosimply as the IDE for convenience. The at least a portion of the IDE maybe executable to develop, e.g., to create, edit, analyze, execute, ordebug, graphical programs that include two or more computational models.Similarly, the graphical program (which may or may not already exist)may include two or more computational models, e.g., graphical data flow(e.g., LabVIEW)/procedural, graphical data flow/simulation (e.g.,Simulink), graphical data flow/textual (e.g., MathScript), and so forth.In some embodiments, the graphical program is or includes a graphicaldata flow program (GDFP), and the IDE is or includes a graphical dataflow program development environment (GDFPDE). In other words, at leastone of the models of computation may be graphical data flow.

In one embodiment, at least one of the two or more models of computationmay include or be a physical domain, e.g., the physical domain mayinclude one or more of an electrical domain, a chemical domain, amechanical domain, an electromagnetic domain, a hydraulic domain, anacoustic domain, an optical domain, or a thermodynamic domain, amongothers.

The IDE may be received from the server computer over the network inresponse to the URI, i.e., may be sent from the server computer to theclient computer, and may be executable in a web browser (e.g., in asandbox, possibly implemented by a plugin) to create, edit, compile orinterpret, execute, analyze, test, optimize, and/or debug graphicalprograms in the web browser, via any of the techniques described herein(or others), as applied to graphical programs that contain multiplecomputational models (i.e., models of computation). Thus, the (at leasta portion of the) IDE may include one or more of an editor, edit timeanalyzer, compiler, execution engine (which may be or include aninterpreter), and/or dynamic (run time) analyzer, among others, asdesired.

The IDE may execute in the web browser to perform various functions,e.g., for developing graphical programs with multiple computationalmodels. For example, in one embodiment, the IDE is executable in the webbrowser to display the graphical program in the web browser, receiveuser input indicating one or more edit operations to be performed on thegraphical program, edit the graphical program in the web browser inaccordance with the one or more edit operations, thereby generating anedited graphical program, display the edited graphical program (e.g.,edited graphical source code) in the web browser, and compile orinterpret, execute, and analyze (and possibly optimize) the editedgraphical program. In some embodiments, the IDE may be furtherexecutable to automatically parallelize one or more portions of thegraphical program in response to analyzing the program, and/or otherwiseoptimize the program.

Note that in various embodiments, to debug the graphical program the IDEmay statically analyze the graphical program at edit time, and/ordynamically analyze the graphical program at run time, i.e., duringexecution. In other embodiments, the (at least a portion of the) IDE mayprovide any functionality desired. Note that the IDE may facilitatedevelopment of portions of the graphical program under respectivecomputational models, and thus, for example, in one embodiment, the IDEmay allow both graphical program editing, as well as textual editing, orgraphical data flow development and simulation development, or graphicaldata flow development and domain specific application development, andso forth. Thus, the editing or development capabilities of the (at leasta portion of the) IDE may support program development under multiplemodels of computation.

Moreover, in one embodiment, the IDE may execute in the web browser todisplay the graphical program in the web browser where respectiveportions of the graphical program are in accordance with the two or morecomputational models, and where the IDE displaying the graphical programin the web browser includes visually indicate each respective portion ofthe program in accordance with its model of computation. For example, inan exemplary embodiment where the graphical program includes graphicaldata flow and textual procedural models, the textual procedural programcode may be visually demarcated, e.g., contained or enclosed in arectangular box, from the graphical data flow code. Other exemplaryvisual designations or indications may utilize color,segregation/grouping within a single window or in respective windows,labeling, and so forth, although it should be noted that any techniquesmay be used to display or visually denote the computationalmodel-specific program code, as desired.

In another embodiment, the URI may indicate a graphical program thatimplements a physical model (PM) or a PM execution engine (PMEE) storedon the server. The GPEE may be executable in a web browser to executephysical models that include two or more physical domains, e.g., two ormore of electrical, chemical, mechanical, hydrodynamic, thermodynamic,and so forth. Similarly, the physical model (which may or may notalready exist) may include two or more physical domains. Note that thephysical model may be implemented using any of a variety of approaches,e.g., graphical programming, graphical data flow (e.g., LabVIEW),simulation (e.g., Simulink), textual programming, state machines, etc.,as desired. In some embodiments, a model of a physical phenomenon may beor include a simulation or emulation of the phenomenon, depending on theresolution and/or basis of the model.

The GPEE may be received from the server computer (received by theclient computer) over the network in response to the URI, and may beexecutable in a web browser to execute multi-domain physical models inthe web browser, via any of the techniques described herein (or others),as applied physical models that contain multiple physical domains. Thus,in one embodiment, the GPEE may include respective portions orfunctionalities for executing respective physical domain specificportions of the physical model.

In various embodiments, the GPEE may include further functionality,e.g., may include (possibly for each physical domain): a graphicalprogram/physical model editor, a graphical program/physical modelcompiler or interpreter, a graphical program/physical model analyzer, agraphical program/physical model optimizer, and so forth, and so may beor include at least a portion of an IDE, e.g., a graphicalprogram/physical model IDE (PMIDE), as desired.

As with the above methods, the GPEE may be configured to execute in asandbox, and so executing the GPEE in the web browser may includeexecuting the GPEE in the sandbox. In embodiments where the sandbox isimplemented as or by a plugin, the GPEE may be executed in the plugin.

In embodiments where the GPEE is a PMIDE, the PMIDE may be executable inthe web browser to perform various functions for developing (graphicalprograms that implement) physical models with multiple physical domains.For example, in one embodiment, the PMIDE is executable in the webbrowser to display the graphical program/physical model in the webbrowser, receive user input indicating one or more edit operations to beperformed on the graphical program/physical model, edit the graphicalprogram/physical model in the web browser in accordance with the one ormore edit operations, thereby generating an edited graphicalprogram/physical model, display the edited graphical program/physicalmodel (e.g., edited graphical source code) in the web browser, andcompile or interpret, execute, and analyze (and possibly optimize, e.g.,automatically parallelize) the edited graphical program/physical model.Note that in some embodiments, the PMIDE may be configured to staticallyanalyze the graphical program/physical model at edit time, and/ordynamically analyze the graphical program/physical model at run time,i.e., during execution. In other embodiments, the (at least a portion ofthe) PMIDE may provide any other functionality related to the programand/or model desired.

In yet another embodiment, the method may be directed to cooperativeexecution of graphical data flow programs in multiple web browsers, fromthe perspective of a client computer.

For example, a network connection may be established between a clientcomputer and a server computer, or, between each of a plurality ofclient computers and the server computer. The server computer may storea graphical data flow program (GDFP), where the GDFP includes arespective plurality of interconnected nodes or icons which visuallyindicate the functionality of the program, as well as a graphical dataflow program execution engine (GDFP execution engine) required by theGDFP to execute. Additionally, the server computer may store a data setfor which processing or analysis is desired. The GDFP may be executablein respective web browsers of the client computers to analyze orotherwise process respective portions of the data set.

A universal resource identifier (URI) may be sent to the server computerfrom the client computer, or, in some embodiments, from each of theclient computers over the network, where the URI indicates the GDFP, theGDFP execution engine, the data set, and/or the server itself, and theGDFP and the GDFP execution engine may be sent from the server computerto the client computer, or in some embodiments, to each client computer,over the network in response to the URI. The GDFP execution engine maybe configured to execute in a sandbox, e.g., a secure executionenvironment, possibly implemented by a plugin. Moreover, a respectiveportion of the data set may also be received by the client computer, orin some embodiments, respective portions of the data set may be receivedby each of the plurality of client computers.

The GDFP execution engine may execute in a web browser of the clientcomputer to analyze the respective portion of the data set, therebygenerating analysis results. In plural client system embodiments, theGDFP execution engine may be executed in a respective web browser ofeach of the plurality of client computers to analyze the respectiveportion of the data set, thereby generating respective analysis results.

The analysis results for the portion of the data set may be sent to arepository, e.g., on a server computer, over the network, which in someembodiments may be the server computer. In plural client systemembodiments, the respective analysis results for the respective portionsof the data set may be sent to the repository over the network, e.g.,for collection, assembly, storage, and possibly further analysis.

In some embodiments, the GDFP execution engine may further execute inthe web browser of each client computer to receive analysis results forthe data set (or portions of the data set) over the network, and displaythe analysis results in the web browser. More generally, in oneembodiment, the method may include displaying a representation of thedata set (or portion of the data set) in the web browser, or displayingthe analysis results for the portion of the data set in the web browser.

Once the portion of the data set has been analyzed, an indication ofcompletion of the analysis of the portion of the data set may be sent tothe server computer. Another portion of the data set may then bereceived from the server computer over the network, and the GDFP may beexecuted in the web browser via the GDFP execution engine to analyze theother portion of the data set, thereby generating analysis results forthe other portion of the data set, and the analysis results for theother portion of the data set sent over the network to the repository.Moreover, the sending an indication, receiving another portion,executing the GDFP, and sending the analysis results, may be repeatedfor further portions of the data set in an iterative manner. In otherwords, as each client computer finishes analyzing its respective portionof data, it may send an indication to that effect to the servercomputer, which may send further data for analysis in response, wherethis process is repeated one or more times in an iterative manner.

Thus, in various embodiments, programs, e.g., graphical programs, may becreated, edited, executed, analyzed, or otherwise operated on, via a webbrowser executing on a client computer.

BRIEF DESCRIPTION OF THE DRAWINGS

A better understanding of the present invention can be obtained when thefollowing detailed description of the preferred embodiment is consideredin conjunction with the following drawings, in which:

FIG. 1A illustrates a computer system configured to implementembodiments of the present invention;

FIG. 1B illustrates a network system comprising two or more computersystems that may implement an embodiment of the present invention;

FIG. 2A illustrates an instrumentation control system according to oneembodiment of the invention;

FIG. 2B illustrates an industrial automation system according to oneembodiment of the invention;

FIG. 3A is a high level block diagram of an exemplary system which mayexecute or utilize graphical programs;

FIG. 3B illustrates an exemplary system which may perform control and/orsimulation functions utilizing graphical programs;

FIG. 4 is an exemplary block diagram of the computer systems of FIGS.1A, 1B, 2A and 2B and 3B;

FIGS. 5A and 5B are a flowchart diagrams illustrating embodiments of amethod for editing a graphical data flow program over a network via aweb browser;

FIGS. 6A and 6B are flowchart diagrams illustrating embodiments of amethod for executing a graphical data flow program over a network via aweb browser;

FIGS. 7A and 7B are flowchart diagrams illustrating embodiments of amethod for statically analyzing a graphical program over a network via aweb browser;

FIGS. 8A and 8B are flowchart diagrams illustrating embodiments of amethod for executing and dynamically analyzing a graphical program overa network via a web browser;

FIGS. 9A and 9B are flowchart diagrams illustrating embodiments of amethod for developing a program over a network via a web browser;

FIGS. 10A and 10B are flowchart diagrams illustrating embodiments of amethod for monitoring or controlling an embedded device over a networkvia a web browser;

FIGS. 11A and 11B are flowchart diagrams illustrating embodiments of amethod for updating an embedded device over a network via a web browser;

FIG. 12 is a flowchart diagram illustrating one embodiment of a methodfor implementing a graphical data flow web application repository withversion control;

FIG. 13 is a flowchart diagram illustrating one embodiment of a methodfor collecting and analyzing graphical data flow web application resultsfrom multiple users;

FIG. 14 is a flowchart diagram illustrating one embodiment of a methodfor licensing and managing shared graphical data flow web applications;

FIGS. 15A and 15B are flowchart diagrams illustrating embodiments of amethod for providing online graphical data flow web application tools orservices for charge;

FIGS. 16A and 16B are flowchart diagrams illustrating embodiments of amethod for developing a graphical program with multiple computationalmodels over a network via a web browser;

FIGS. 17A and 17B are flowchart diagrams illustrating embodiments of amethod for executing a physical model with multiple physical domains viaa web browser;

FIGS. 18A and 18B are flowchart diagrams illustrating embodiments of amethod for cooperative execution of graphical data flow programs inmultiple web browsers;

FIG. 19 is a flowchart diagram illustrating one embodiment of anexemplary user experience with respect to shared or community basedprogram development;

FIG. 20 compares exemplary distribution of software functionality in aconventional desktop application and a corresponding implementationusing web plugin technology, according to one embodiment;

FIG. 21 illustrates an exemplary graphical program, according to oneembodiment;

FIG. 22 illustrates exemplary I/O topologies for a web application,according to one embodiment;

FIG. 23 illustrates an exemplary embodiment of a “hardware buddy list”of I/O devices for a web application;

FIG. 24 illustrates exemplary execution topologies for a webapplication, according to one embodiment;

FIG. 25 illustrates an exemplary development system or cycle for aweb-based interactive development environment (IDE), according to oneembodiment;

FIG. 26 illustrates utilization of resources by a web applicationwithout requiring the Internet; and

FIG. 27 illustrates utilization of a “hardware” resource by a webapplication, where the resource is a hardware device, or a simulation ofthe hardware device, according to one embodiment.

While the invention is susceptible to various modifications andalternative forms, specific embodiments thereof are shown by way ofexample in the drawings and are herein described in detail. It should beunderstood, however, that the drawings and detailed description theretoare not intended to limit the invention to the particular formdisclosed, but on the contrary, the intention is to cover allmodifications, equivalents and alternatives falling within the spiritand scope of the present invention as defined by the appended claims.

DETAILED DESCRIPTION OF THE INVENTION

Incorporation by Reference

The following references are hereby incorporated by reference in theirentirety as though fully and completely set forth herein:

U.S. Provisional Application 60/179,282, titled “Graphical Data FlowProgram Operations in a Browser”, filed May 18, 2009.

U.S. Provisional Application 61/230,947, titled “Graphical Data FlowProgram Operations in a Web Browser”, filed Aug. 1, 2009.

U.S. Pat. No. 4,914,568 titled “Graphical System for Modeling a Processand Associated Method,” issued on Apr. 3, 1990.

U.S. Pat. No. 5,481,741 titled “Method and Apparatus for ProvidingAttribute Nodes in a Graphical Data Flow Environment”.

U.S. Pat. No. 6,173,438 titled “Embedded Graphical Programming System”filed Aug. 18, 1997.

U.S. Pat. No. 6,219,628 titled “System and Method for Configuring anInstrument to Perform Measurement Functions Utilizing Conversion ofGraphical Programs into Hardware Implementations,” filed Aug. 18, 1997.

U.S. Patent Application Publication No. 20010020291 (Ser. No.09/745,023) titled “System and Method for Programmatically Generating aGraphical Program in Response to Program Information,” filed Dec. 20,2000.

U.S. Pat. No. 7,506,304, titled “Graphical Data Flow ProgrammingEnvironment with First Model of Computation that Includes a StructureSupporting Second Model of Computation”, filed on Jun. 16, 2004.

U.S. Patent Application Publication 2008/0270920, titled “AutomaticallyGenerating a Graphical Program with a Plurality of Models ofComputation”, filed on Apr. 24, 2007.

U.S. patent application Ser. No. 11/609,928, titled “Coupling a VirtualInstrument to a Circuit Diagram”, filed Dec. 13, 2006.

U.S. patent application Ser. No. 11/396,740, titled “Web Browser GraphUser Interface Element with Rich Interactive Capabilities”, filed Apr.3, 2006.

U.S. patent application Ser. No. 11/396,652, titled “Simultaneous Updateof a Plurality of User Interface Elements Displayed in a Web Browser”,filed Apr. 3, 2006.

U.S. Patent Application Publication 2008/0109779, titled “SystemSimulation and Graphical Data Flow Programming in a Common Environment”,filed Apr. 2, 2007.

U.S. Pat. No. 7,302,675, titled “System and Method for Analyzing aGraphical Program Using Debugging Graphical Programs”, filed Apr. 10,2002.

U.S. Pat. No. 7,024,660, titled “Debugging A Program Intended to Executeon a Reconfigurable Device Using a Test Feed-Through Configuration”,filed Oct. 29, 2001.

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Terms

The following is a glossary of terms used in the present application:

Memory Medium—Any of various types of memory devices or storage devices.The term “memory medium” is intended to include an installation medium,e.g., a CD-ROM, floppy disks, or tape device; a computer system memoryor random access memory such as DRAM, DDR RAM, SRAM, EDO RAM, RambusRAM, etc.; or a non-volatile memory such as a magnetic media, e.g., ahard drive, or optical storage. The memory medium may comprise othertypes of memory as well, or combinations thereof. In addition, thememory medium may be located in a first computer in which the programsare executed, and/or may be located in a second different computer whichconnects to the first computer over a network, such as the Internet. Inthe latter instance, the second computer may provide programinstructions to the first computer for execution. The term “memorymedium” may include two or more memory mediums which may reside indifferent locations, e.g., in different computers that are connectedover a network.

Carrier Medium—a memory medium as described above, as well as a physicaltransmission medium, such as a bus, network, and/or other physicaltransmission medium that conveys signals such as electrical,electromagnetic, or digital signals.

Programmable Hardware Element—includes various hardware devicescomprising multiple programmable function blocks connected via aprogrammable interconnect. Examples include FPGAs (Field ProgrammableGate Arrays), PLDs (Programmable Logic Devices), FPOAs (FieldProgrammable Object Arrays), and CPLDs (Complex PLDs). The programmablefunction blocks may range from fine grained (combinatorial logic or lookup tables) to coarse grained (arithmetic logic units or processorcores). A programmable hardware element may also be referred to as“reconfigurable logic”.

Program—the term “program” is intended to have the full breadth of itsordinary meaning. The term “program” includes 1) a software programwhich may be stored in a memory and is executable by a processor or 2) ahardware configuration program useable for configuring a programmablehardware element.

Software Program—the term “software program” is intended to have thefull breadth of its ordinary meaning, and includes any type of programinstructions, code, script and/or data, or combinations thereof, thatmay be stored in a memory medium and executed by a processor. Exemplarysoftware programs include programs written in text-based programminglanguages, such as C, C++, PASCAL, FORTRAN, COBOL, JAVA, assemblylanguage, etc.; graphical programs (programs written in graphicalprogramming languages); assembly language programs; programs that havebeen compiled to machine language; scripts; and other types ofexecutable software. A software program may comprise two or moresoftware programs that interoperate in some manner. Note that variousembodiments described herein may be implemented by a computer orsoftware program. A software program may be stored as programinstructions on a memory medium.

Hardware Configuration Program—a program, e.g., a netlist or bit file,that can be used to program or configure a programmable hardwareelement.

Graphical Program—A program comprising a plurality of interconnectednodes or icons, wherein the plurality of interconnected nodes or iconsvisually indicate functionality of the program. Graphical function nodesmay also be referred to as blocks.

The following provides examples of various aspects of graphicalprograms. The following examples and discussion are not intended tolimit the above definition of graphical program, but rather provideexamples of what the term “graphical program” encompasses:

The nodes in a graphical program may be connected in one or more of adata flow, control flow, and/or execution flow format. The nodes mayalso be connected in a “signal flow” format, which is a subset of dataflow.

Exemplary graphical program development environments which may be usedto create graphical programs include LabVIEW®, DasyLab™, DiaDem™ andMatrixx/SystemBuild™ from National Instruments, Simulink® from theMathWorks, VEE™ from Agilent, WiT™ from Coreco, Vision Program Manager™from PPT Vision, SoftWIRE™ from Measurement Computing, Sanscript™ fromNorthwoods Software, Khoros™ from Khoral Research, SnapMaster™ from HEMData, VisSim™ from Visual Solutions, ObjectBench™ by SES (Scientific andEngineering Software), and VisiDAQ™ from Advantech, among others.

The term “graphical program” includes models or block diagrams createdin graphical modeling environments, wherein the model or block diagramcomprises interconnected blocks (i.e., nodes) or icons that visuallyindicate operation of the model or block diagram; exemplary graphicalmodeling environments include Simulink®, SystemBuild™, VisSim™,Hypersignal Block Diagram™, etc.

A graphical program may be represented in the memory of the computersystem as data structures and/or program instructions. The graphicalprogram, e.g., these data structures and/or program instructions, may becompiled or interpreted to produce machine language that accomplishesthe desired method or process as shown in the graphical program.

Input data to a graphical program may be received from any of varioussources, such as from a device, unit under test, a process beingmeasured or controlled, another computer program, a database, or from afile. Also, a user may input data to a graphical program or virtualinstrument using a graphical user interface, e.g., a front panel.

A graphical program may optionally have a GUI associated with thegraphical program. In this case, the plurality of interconnected blocksor nodes are often referred to as the block diagram portion of thegraphical program.

Node—In the context of a graphical program, an element that may beincluded in a graphical program. The graphical program nodes (or simplynodes) in a graphical program may also be referred to as blocks. A nodemay have an associated icon that represents the node in the graphicalprogram, as well as underlying code and/or data that implementsfunctionality of the node. Exemplary nodes (or blocks) include functionnodes, sub-program nodes, terminal nodes, structure nodes, etc. Nodesmay be connected together in a graphical program by connection icons orwires.

Data Flow Program—A Software Program in which the program architectureis that of a directed graph specifying the flow of data through theprogram, and thus functions execute whenever the necessary input dataare available. Data flow programs can be contrasted with proceduralprograms, which specify an execution flow of computations to beperformed.

Graphical Data Flow Program (or Graphical Data Flow Diagram)—A GraphicalProgram which is also a Data Flow Program. A Graphical Data Flow Programcomprises a plurality of interconnected nodes (blocks), wherein at leasta subset of the connections among the nodes visually indicate that dataproduced by one node is used by another node. A LabVIEW VI is oneexample of a graphical data flow program. A Simulink block diagram isanother example of a graphical data flow program.

Graphical User Interface—this term is intended to have the full breadthof its ordinary meaning. The term “Graphical User Interface” is oftenabbreviated to “GUI”. A GUI may comprise only one or more input GUIelements, only one or more output GUI elements, or both input and outputGUI elements.

The following provides examples of various aspects of GUIs. Thefollowing examples and discussion are not intended to limit the ordinarymeaning of GUI, but rather provide examples of what the term “graphicaluser interface” encompasses:

A GUI may comprise a single window having one or more GUI Elements, ormay comprise a plurality of individual GUI Elements (or individualwindows each having one or more GUI Elements), wherein the individualGUI Elements or windows may optionally be tiled together.

A GUI may be associated with a graphical program. In this instance,various mechanisms may be used to connect GUI Elements in the GUI withnodes in the graphical program. For example, when Input Controls andOutput Indicators are created in the GUI, corresponding nodes (e.g.,terminals) may be automatically created in the graphical program orblock diagram. Alternatively, the user can place terminal nodes in theblock diagram which may cause the display of corresponding GUI Elementsfront panel objects in the GUI, either at edit time or later at runtime. As another example, the GUI may comprise GUI Elements embedded inthe block diagram portion of the graphical program.

Front Panel—A Graphical User Interface that includes input controls andoutput indicators, and which enables a user to interactively control ormanipulate the input being provided to a program, and view output of theprogram, while the program is executing.

A front panel is a type of GUI. A front panel may be associated with agraphical program as described above.

In an instrumentation application, the front panel can be analogized tothe front panel of an instrument. In an industrial automationapplication the front panel can be analogized to the MMI (Man MachineInterface) of a device. The user may adjust the controls on the frontpanel to affect the input and view the output on the respectiveindicators.

Graphical User Interface Element—an element of a graphical userinterface, such as for providing input or displaying output. Exemplarygraphical user interface elements comprise input controls and outputindicators.

Input Control—a graphical user interface element for providing userinput to a program. An input control displays the value input the by theuser and is capable of being manipulated at the discretion of the user.Exemplary input controls comprise dials, knobs, sliders, input textboxes, etc.

Output Indicator—a graphical user interface element for displayingoutput from a program. Exemplary output indicators include charts,graphs, gauges, output text boxes, numeric displays, etc. An outputindicator is sometimes referred to as an “output control”.

Computer System—any of various types of computing or processing systems,including a personal computer system (PC), mainframe computer system,workstation, network appliance, Internet appliance, personal digitalassistant (PDA), television system, grid computing system, or otherdevice or combinations of devices. In general, the term “computersystem” can be broadly defined to encompass any device (or combinationof devices) having at least one processor that executes instructionsfrom a memory medium.

Measurement Device—includes instruments, data acquisition devices, smartsensors, and any of various types of devices that are configured toacquire and/or store data. A measurement device may also optionally befurther configured to analyze or process the acquired or stored data.Examples of a measurement device include an instrument, such as atraditional stand-alone “box” instrument, a computer-based instrument(instrument on a card) or external instrument, a data acquisition card,a device external to a computer that operates similarly to a dataacquisition card, a smart sensor, one or more DAQ or measurement cardsor modules in a chassis, an image acquisition device, such as an imageacquisition (or machine vision) card (also called a video capture board)or smart camera, a motion control device, a robot having machine vision,and other similar types of devices. Exemplary “stand-alone” instrumentsinclude oscilloscopes, multimeters, signal analyzers, arbitrary waveformgenerators, spectroscopes, and similar measurement, test, or automationinstruments.

A measurement device may be further configured to perform controlfunctions, e.g., in response to analysis of the acquired or stored data.For example, the measurement device may send a control signal to anexternal system, such as a motion control system or to a sensor, inresponse to particular data. A measurement device may also be configuredto perform automation functions, i.e., may receive and analyze data, andissue automation control signals in response.

Subset—in a set having N elements, the term “subset” comprises anycombination of one or more of the elements, up to and including the fullset of N elements. For example, a subset of a plurality of icons may beany one icon of the plurality of the icons, any combination of one ormore of the icons, or all of the icons in the plurality of icons. Thus,a subset of an entity may refer to any single element of the entity aswell as any portion up to and including the entirety of the entity.

Model of Computation (or Computational Model)—a model for visuallyspecifying or visually representing program code to a user. A “model ofcomputation” may also be considered as a set of program semantics of aprogramming language. Examples of “models of computation” includevarious forms of graphical data flow, such as data driven data flow(e.g., LabVIEW), demand driven data flow, and statically-scheduled dataflow (including, but not limited to, synchronous data flow,heterochronous data flow, cyclo-static data flow, parameterizedsynchronous data flow, and discrete time data flow); synchronousreactive; process network; state diagram; control flow diagram;simulation diagram models (continuous time simulation data flow);various forms of text-based code (such as Matlab and MathScript, C, C++,etc.); and/or physical simulation (including physical domains such ascircuits, hydrodynamics, mechanics, device modeling, thermodynamics,etc.), among others. “Statically-scheduled data flow” is data flow inwhich the firing pattern (i.e. execution order) of nodes isdata-independent and can, therefore, be determined before run-time, e.g.at compile time. A “process network” is a set of deterministicsequential processes communicating through FIFO channels. “Synchronousreactive” can refer to a program where operations are given a certainamount of time to react, and if this constraint holds, the rest of thesystem appears synchronous.

A program portion may be visually represented on a display in a firstcomputational model, but may in fact be actually implemented in thecomputer using a different computational model that may be hidden fromthe user. For example, Matlab is a text-based scripting language that isimplanted in the C programming language. As another example, MathScriptis a text-based scripting language implemented in the LabVIEW graphicalprogramming language. A program portion may be represented in a firstmodel of computation to provide a more intuitive visual representationof the functionality of the program portion, e.g., to allow the user tomore readily understand and/or edit the program portion.

FIG. 1A—Computer System

FIG. 1A illustrates a computer system 82 configured to perform data flowprogram operations, e.g., editing, executing, analyzing, etc., a dataflow program via a web browser. Embodiments of methods for editing,executing, or analyzing graphical programs (among other functionalities)via a web browser are described below.

As shown in FIG. 1A, the computer system 82 may include a display deviceconfigured to display the graphical program as the graphical program iscreated, edited, executed, or analyzed, among other functions, e.g., ina web browser. Note that as used herein, the term “web browser” has thefull extent of its ordinary accepted meaning. The display device mayalso be configured to display a graphical user interface or front panelof the graphical program during execution of the graphical program. Thegraphical user interface may comprise any type of graphical userinterface, e.g., depending on the computing platform, and may becomprised or implemented via the web browser, as will be described inmore detail below.

The computer system 82 may include at least one memory medium on whichone or more computer programs or software components according to oneembodiment of the present invention may be stored. For example, thememory medium may store a web browser, and one or more programs, e.g.,graphical programs, for performing the methods described herein.Additionally, the memory medium may store an interactive developmentenvironment (IDE), e.g., a graphical programming development environmentapplication, used to create, edit, execute, and/or analyze suchgraphical programs, or other types of programs. The memory medium mayalso store operating system software, as well as other software foroperation of the computer system. Various embodiments further includereceiving or storing instructions and/or data implemented in accordancewith the foregoing description upon a carrier medium.

FIG. 1B—Computer Network

FIG. 1B illustrates a system including a first computer system 82 thatis coupled to a second computer system 90. The computer system 82 may becoupled via a network 84 (or a computer bus) to the second computersystem 90. The computer systems 82 and 90 may each be any of varioustypes, as desired. The network 84 can also be any of various types,including a LAN (local area network), WAN (wide area network), theInternet, or an Intranet, among others. The computer systems 82 and 90may execute a graphical program (or other type of program) in adistributed fashion. For example, computer systems 82 and 90 may operateas a client/server system, where a first computer (e.g., computer 82)may execute a web browser whereby a user may interact with, e.g.,control and/or communicate with a second computer (e.g., computer 90),e.g., via a browser. The second computer may store various softwarecomponents according to embodiments of the present invention, e.g.,web-server programs, application programs, e.g., graphical data flowprograms, and so forth. In some embodiments, the second computer mayalso store other components, such as an interactive developmentenvironment (IDE), or portions thereof, e.g., a graphical data flowprogram execution engine, and one or more analysis programs foranalyzing programs, e.g., graphical data flow programs. In oneembodiment, the second computer may store programs (and data)implementing other applications or tools, such as a graphical data flowprogram repository, etc., according to various embodiments of thepresent invention.

Moreover, as shown in FIGS. 2A, 2B, 3A, and 3B, the client and/or servercomputer(s) may be coupled to any of a variety of other devices, e.g.,measurement, automation, and/or control devices, depending upon theparticular application to which the graphical data flow program relates.In other embodiments, computer 90 may comprise an embedded device. Inone embodiment, the device may include a programmable hardware elementand/or may include a processor and memory medium which may execute areal time operating system. Thus, for example, computer system 90 may bean embedded server, and thus may have limited or even no displaycapabilities.

Exemplary Systems

Embodiments of the present invention may be involved with performingtest and/or measurement functions; controlling and/or modelinginstrumentation or industrial automation hardware; modeling andsimulation functions, e.g., modeling or simulating a device or productbeing developed or tested, etc. Exemplary test applications where thegraphical program may be used include hardware-in-the-loop testing andrapid control prototyping, among others.

However, it is noted that embodiments of the present invention can beused for a plethora of applications and is not limited to the aboveapplications. In other words, applications discussed in the presentdescription are exemplary only, and embodiments of the present inventionmay be used in any of various types of systems. Thus, embodiments of thesystem and method of the present invention is configured to be used inany of various types of applications, including the control of othertypes of devices such as multimedia devices, video devices, audiodevices, telephony devices, Internet devices, etc., as well as generalpurpose software applications such as word processing, spreadsheets,network control, network monitoring, financial applications, games, dataprocessing, etc.

FIG. 2A illustrates an exemplary instrumentation control system 100which may implement embodiments of the invention. The system 100comprises a host computer 82 which couples to one or more instruments.The host computer 82 may comprise a CPU, a display screen, memory, andone or more input devices such as a mouse or keyboard as shown. Thecomputer 82 may operate with the one or more instruments to analyze,measure or control a unit under test (UUT) or process 150.

The one or more instruments may include a GPIB instrument 112 andassociated GPIB interface card 122, a data acquisition board 114inserted into or otherwise coupled with chassis 124 with associatedsignal conditioning circuitry 126, a VXI instrument 116, a PXIinstrument 118, a video device or camera 132 and associated imageacquisition (or machine vision) card 134, a motion control device 136and associated motion control interface card 138, and/or one or morecomputer based instrument cards 142, among other types of devices. Thecomputer system may couple to and operate with one or more of theseinstruments. The instruments may be coupled to the unit under test (UUT)or process 150, or may be coupled to receive field signals, typicallygenerated by transducers. The system 100 may be used in a dataacquisition and control application, in a test and measurementapplication, an image processing or machine vision application, aprocess control application, a man-machine interface application, asimulation application, or a hardware-in-the-loop validationapplication, among others.

FIG. 2B illustrates an exemplary industrial automation system 160 whichmay implement embodiments of the invention. The industrial automationsystem 160 is similar to the instrumentation or test and measurementsystem 100 shown in FIG. 2A. Elements which are similar or identical toelements in FIG. 2A have the same reference numerals for convenience.The system 160 may comprise a computer 82 which couples to one or moredevices or instruments. The computer 82 may comprise a CPU, a displayscreen, memory, and one or more input devices such as a mouse orkeyboard as shown. The computer 82 may operate with the one or moredevices to perform an automation function with respect to a process ordevice 150, such as MMI (Man Machine Interface), SCADA (SupervisoryControl and Data Acquisition), portable or distributed data acquisition,process control, advanced analysis, or other control, among others.

The one or more devices may include a data acquisition board 114inserted into or otherwise coupled with chassis 124 with associatedsignal conditioning circuitry 126, a PXI instrument 118, a video device132 and associated image acquisition card 134, a motion control device136 and associated motion control interface card 138, a fieldbus device170 and associated fieldbus interface card 172, a PLC (ProgrammableLogic Controller) 176, a serial instrument 182 and associated serialinterface card 184, or a distributed data acquisition system, such asthe Fieldpoint system available from National Instruments, among othertypes of devices.

FIG. 3A is a high level block diagram of an exemplary system which mayexecute or utilize graphical programs. FIG. 3A illustrates a generalhigh-level block diagram of a generic control and/or simulation systemwhich comprises a controller 92 and a plant 94. The controller 92represents a control system/algorithm the user may be trying to develop.The plant 94 represents the system the user may be trying to control.For example, if the user is designing an ECU for a car, the controller92 is the ECU and the plant 94 is the car's engine (and possibly othercomponents such as transmission, brakes, and so on.) As shown, a usermay create a graphical program that specifies or implements thefunctionality of one or both of the controller 92 and the plant 94. Forexample, a control engineer may use a modeling and simulation tool tocreate a model (graphical program) of the plant 94 and/or to create thealgorithm (graphical program) for the controller 92.

FIG. 3B illustrates an exemplary system which may perform control and/orsimulation functions. As shown, the controller 92 may be implemented bya computer system 82 or other device (e.g., including a processor andmemory medium and/or including a programmable hardware element) thatexecutes or implements a graphical program. In a similar manner, theplant 94 may be implemented by a computer system or other device 144(e.g., including a processor and memory medium and/or including aprogrammable hardware element) that executes or implements a graphicalprogram, or may be implemented in or as a real physical system, e.g., acar engine.

In one embodiment of the invention, one or more graphical programs maybe created which are used in performing rapid control prototyping. RapidControl Prototyping (RCP) generally refers to the process by which auser develops a control algorithm and quickly executes that algorithm ona target controller connected to a real system. The user may develop thecontrol algorithm using a graphical program, and the graphical programmay execute on the controller 92, e.g., on a computer system or otherdevice. The computer system 82 may be a platform that supports real timeexecution, e.g., a device including a processor that executes a realtime operating system (RTOS), or a device including a programmablehardware element.

In one embodiment of the invention, one or more graphical programs maybe created which are used in performing Hardware in the Loop (HIL)simulation. Hardware in the Loop (HIL) refers to the execution of theplant model 94 in real time to test operation of a real controller 92.For example, once the controller 92 has been designed, it may beexpensive and complicated to actually test the controller 92 thoroughlyin a real plant, e.g., a real car. Thus, the plant model (implemented bya graphical program) is executed in real time to make the realcontroller 92 “believe” or operate as if it is connected to a realplant, e.g., a real engine.

In the embodiments of FIGS. 2A, 2B, and 3B above, one or more of thevarious devices may couple to each other over a network, such as theInternet. In one embodiment, the user operates to select a target devicefrom a plurality of possible target devices for programming orconfiguration using a graphical program. Thus the user may create agraphical program on a computer and use (execute) the graphical programon that computer or deploy the graphical program to a target device (forremote execution on the target device) that is remotely located from thecomputer and coupled to the computer through a network.

Graphical software programs which perform data acquisition, analysisand/or presentation, e.g., for measurement, instrumentation control,industrial automation, modeling, or simulation, such as in theapplications shown in FIGS. 2A and 2B, may be referred to as virtualinstruments.

It should be noted that while many of the embodiments described hereinare directed to graphical programs, such as graphical data flowprograms, in various other embodiments, the techniques disclosed hereinmay be used or implemented with respect to other types of programs,e.g., textual programs, textual data flow programs, simulations, models,e.g., physical models (i.e., models of physical phenomena or systems),and so forth, as desired.

FIG. 4—Computer System Block Diagram

FIG. 4 is a block diagram representing one embodiment of the computersystem 82 and/or 90 illustrated in FIGS. 1A and 1B, or computer system82 shown in FIG. 2A or 2B. It is noted that any type of computer systemconfiguration or architecture can be used as desired, and FIG. 4illustrates a representative PC embodiment. It is also noted that thecomputer system may be a general purpose computer system, a computerimplemented on a card installed in a chassis, or other types ofembodiments. Elements of a computer not necessary to understand thepresent description have been omitted for simplicity.

The computer may include at least one central processing unit or CPU(processor) 160 which is coupled to a processor or host bus 162. The CPU160 may be any of various types, including an x86 processor, e.g., aPentium class, a PowerPC processor, a CPU from the SPARC family of RISCprocessors, as well as others. A memory medium, typically comprising RAMand referred to as main memory, 166 is coupled to the host bus 162 bymeans of memory controller 164. The main memory 166 may store thegraphical program to be edited, executed, and/or analyzed (e.g.,debugged), among other functions, via a web browser, as well as softwaresupporting such web-based interactions, which may include an IDE underwhich the graphical program may be developed, edited, executed,analyzed, etc. The main memory may also store operating system software,as well as other software for operation of the computer system. Inanother embodiment, the computer may store and execute a web browser viawhich a user may interact with a another computer, e.g., for downloadingand executing one or more of the above software items, e.g., as webapplications, as well as other software necessary or desired foroperation of the computer, as described above with respect to computers82 and 90. In embodiments where the computer is a server computer, e.g.,computer 90, the computer may store web server software, whereby theserver computer may interact with client computers via web browsersexecuting on the client computers, as well as application softwareimplementing specified web hosted functionality, e.g., programrepositories, downloadable IDE web applications, and so forth. Furtherembodiments are described below.

The host bus 162 may be coupled to an expansion or input/output bus 170by means of a bus controller 168 or bus bridge logic. The expansion bus170 may be the PCI (Peripheral Component Interconnect) expansion bus,although other bus types can be used. The expansion bus 170 includesslots for various devices such as described above. The computer 82further comprises a video display subsystem 180 and hard drive 182coupled to the expansion bus 170. The computer 82 may also comprise aGPIB card 122 coupled to a GPIB bus 112, and/or an MXI device 186coupled to a VXI chassis 116.

As shown, and as indicated above, a device 190 may also be connected tothe computer. The device 190 may include a processor and memory whichmay execute a real time operating system. The device 190 may also orinstead comprise a programmable hardware element. The computer systemmay be configured to deploy a graphical program to the device 190 forexecution of the graphical program on the device 190, where a user ofthe computer may interact with the graphical program via a web browser.The deployed graphical program may take the form of graphical programinstructions or data structures that directly represents the graphicalprogram. Alternatively, the deployed graphical program may take the formof text code (e.g., C code) generated from the graphical program. Asanother example, the deployed graphical program may take the form ofcompiled code generated from either the graphical program or from textcode that in turn was generated from the graphical program. In otherembodiments, the device may perform other software functions, as will bedescribed in more detail below.

Note that the software facilitating or implementing the web browserbased interactions may take any number of forms, and may be distributedbetween the computers as desired. For example, in one embodiment, thebrowser may invoke or utilize one or more locally executed programs (onthe client computer system), e.g., graphical data flow programs,execution engines, development systems, plug-ins, etc., that mayfacilitate or implement at least a part of the functionality of thesystem, and that may be downloaded from a server computer over a networkfor execution, as will be described below in more detail. Moregenerally, the embodiments contemplated range from an embodiment inwhich all functionality, including program editing, execution, oranalysis, is implemented on the client computer system (but stillinterfaced via a web browser), to embodiments in which some orsubstantially all the functionality is implemented on the second (ormore) computer(s), e.g., where the client computer executes the webbrowser and minimal supporting software for interactions with thesecond, e.g., server, computer, where the primary functionality isimplemented.

In yet another embodiment, various of the functionalities describedabove may not only be distributed across multiple computers, but may bereplicated on multiple machines. More generally, multiple instances ofvarious software components implementing portions of the functionalitydescribed herein may be deployed and executed on respective computers,e.g., for cooperative development or analysis of graphical programs,e.g., graphical data flow programs, or data. Thus, for example, multipleusers may utilize web browsers to execute or interact with multiplegraphical programs, IDEs, analysis tools, and so forth, thus forming aninteractive community of designers, developers, and users, whereby largecomplex systems may be developed, executed, debugged, and managedcooperatively, or where graphical data flow programs may be shared amongdevelopers or users of the community.

The following describes various embodiments of editing, analyzing ordebugging, and executing programs, e.g., graphical data flow programs,via web applications downloaded from a server computer. It should benoted that in various embodiments, any of the techniques disclosedherein may be used in any combinations desired. It should be furthernoted that an application such as an IDE that performs a specifiedfunctionality may be referred to by that functionality, e.g., an IDEthat includes editing functionality may be referred to as an editor; anIDE or other program that includes editing, execution, and/or analysisfunctionality may be referred to as an IDE, an execution engine, and/oran analyzer, as desired.

FIG. 5A—Flowchart of a Method for Editing a Graphical Program over aNetwork Via a Web Browser—Client Side

FIG. 5A is a flowchart diagram illustrating one embodiment of a methodfor editing a graphical program over a network via a web browser, fromthe perspective of a client computer, e.g., computer 82, or anothercomputer. The method shown in FIG. 5A may be used in conjunction withany of the computer systems or devices shown in the above Figures, amongother devices. In various embodiments, some of the method elements shownmay be performed concurrently, in a different order than shown, or maybe omitted. Additional method elements may also be performed as desired.As shown, this method may operate as follows.

In 502, a network connection may be established with a server computerover a network. For example, a user may open a web browser and directthe browser to the server computer.

In 504, a universal resource identifier (URI) may be sent to the servercomputer over the network, where the URI indicates a graphical data flowprogram (GDFP) or a graphical data flow program editor (GDFP editor) forcreating or editing the GDFP. Note that in some embodiments, methodelements 502 and 504 may be performed together. For example, the usermay click on a link or may otherwise indicate the URI, which mayautomatically invoke the connection with the server computer.

In 506, the GDFP editor may be received from the server computer overthe network in response to the URI. In one embodiment, the GDFP is apre-existing GDFP, where the GDFP editor is associated with thepre-existing GDFP, and where the URI specifies the pre-existing GDFP,thereby also indicating the associated GDFP editor. In this embodiment,the GDFP may also be received from the server computer in response tothe URI. Alternatively, in embodiments where the GDFP is not apre-existing GDFP, the URI may specify the GDFP editor, and the GDFPeditor may be executable in the web browser to receive user inputspecifying creation of the GDFP, and create the GDFP in response to theuser input. Note that in embodiments where the GDFP is a pre-existingGDFP, the editor may load with the indicated GDFP, whereas inembodiments where the GDFP is not a pre-existing GDFP, the editor mayload empty or with a new (e.g., blank or templated) document or programfile.

In 508, the GDFP editor may be executed in a web browser. In someembodiments, the GDFP editor may be configured to execute in a sandbox,where the sandbox is or includes a secure execution environment for theGDFP editor. Thus, executing the GDFP editor in the web browser mayinclude executing the GDFP editor in the sandbox. Note that the sandboxmay be implemented in any of a variety of ways. For example, in oneembodiment, the sandbox may be implemented by a plugin, and so executingthe GDFP editor in the sandbox may include executing the GDFP editor inthe plugin.

Examples of plugins for executing web applications include Adobe Flash™and Microsoft Corporation's Silverlight™ framework or system, as well asplugins implemented via the JAVA programming language. In someembodiments, the plugin may operate as a virtual machine, e.g.,providing an execution infrastructure or environment within which theapplication may execute. In some embodiments, if the plugin is notalready resident on the client computer, the user may be directed (e.g.,via a text message, a link, etc.) to a source from which the plugin maybe downloaded.

Note that there are numerous benefits to executing applications as webapplications via plugins. For example, with conventional applications,much of the functionality required for operation must be provided by theapplication itself, which may result in large application sizes. Forexample, in the case of a conventional program editor, the applicationmust generally implement functionality for handling (alphanumeric)strings, file I/O, memory management, and various other infrastructurefunctionalities, and so downloading and installation of the applicationmay require significantly more time and resources to accomplish. Incontrast, with a web application that executes in a web browser, e.g.,via a plugin, the plugin may provide some, most, or even all, of thisfunctionality, leaving the web application (e.g., the editor) to providethe application functionality, e.g., “functional” operations, e.g., inthe editor case, editor functionality.

FIG. 20 illustrates this concept, comparing an exemplary set ofapplication software functions or modules required by and included in astandalone installation of a graphical program development environment(left), including application functionality, infrastructure, and kernelfunctions or modules, with the same functions or modules divided betweena corresponding web application and a plugin, according to oneembodiment. More specifically, FIG. 20 illustrates an exemplarydistribution of functionality or software components with respect to aLabVIEW software stack for a typical standalone application, and for oneembodiment of an implementation that leverages the functionality of aplugin, specifically, the Microsoft .Net-based Silverlight™ system.

As may be seen, in the conventional or standalone implementation, theapplication (denoted as a source by “NI” ovals, per the legend at thebottom of the figure) must provide the “pure” application functions, aswell as a host of infrastructure modules or components, leaving onlykernel functionality to be provided by the host operating system(denoted by “Host OS” ovals, per the legend). In direct contrast, in theplugin implementation, the application is only responsible for the“pure” application functionality, where both the infrastructure andkernel functions are provided by the plugin system, in this case,.Net/Silverlight/Moonlight software (denoted by “.Net” ovals, per thelegend). It should be noted that the functions or modules shown aremeant to be illustrative only, and do not necessarily represent allfunctionality or software components of the application.

Note that in this exemplary embodiment, the kernel requiresapproximately 100 k of memory, the infrastructure requires approximately5M, and the “pure” application functions require approximately 1-2M.Thus, the size of the application to be downloaded to the clientcomputer may be reduced from approximately 6-7M to approximately 1-2M byutilizing the plugin technology. Thus, significantly less storage space,and correspondingly shorter download times, are required for the pluginimplementation. Additionally, note that in the conventional (desktop)implementation, many subsystems may have their own unique architectures(e.g., strings, memory management, API conventions), some of which maybe written by the developer/vendor, and some of which may be third partycomponents encapsulated in wrappers. Many of the internal API functionsmay not be accessible from the development environment/language, andthus may put developers at a disadvantage. Additionally, the use ofwrappers may entail significant added overhead.

In contrast, in the .NET stack the memory management, API, and threadtools and reflection may be consistent. The term “reflection” is a termof art referring to the ability to dynamically determine properties,methods, and events, without the need for a separate descriptor file(which could be out of date). A net effect of this feature is that itremoves the need for wrappers and allows calling the API with noperformance penalty.

Thus, in some embodiments, the application may be implemented as a webapplication, written in such a way as to take advantage of plugintechnology, and thus benefiting from a consistent infrastructure, andsmaller footprint and download times. Moreover, note that offloadingkernel and infrastructure responsibilities to the plugin system greatlysimplifies further development and maintenance of the application, sincethe developers need not maintain the functionality provided by theplugin technology itself. Note that the particular plugin systemsdescribed herein are intended to be exemplary only, and that any otherplugin or virtual machine technologies may be used as desired, e.g.,Moonlight (open source implementation of Silverlight for GNU/Linuxsystems), Microsoft Corporation's Windows Presentation Foundation, andso forth.

In 510, the GDFP may be displayed in the web browser, where the GDFPincludes a plurality of interconnected nodes or icons which visuallyindicate the functionality of the program. FIG. 21 illustrates anexemplary graphical data flow program that includes a graphicaliterative structure, e.g., a graphical FOR loop 2110, used to implementa matrix multiplication, which, as may be seen, contains two further FORloops, i.e., nested FOR loops. It should be noted, however, that theGDFP of FIG. 21 is intended to be exemplary only.

In 512, user input may be received to the GDFP editor executing in theweb browser, where the user input indicates one or more edit operationsto be performed on the GDFP, and in 514, the GDFP may be edited in theweb browser via the GDFP editor in accordance with the one or more editoperations, thereby generating an edited GDFP. For example, the user may“drag and drop” various graphical function nodes onto a block diagramand “wire” the nodes together. Further details regarding creation andediting of graphical programs is provided below under the heading“Creation of a Graphical Program”.

In 516, the edited GDFP may be displayed in the web browser. Forexample, an edited block diagram of the GDFP may be displayed (see,e.g., FIG. 21). Displaying the edited block diagram in the web browsermay include displaying edited block diagram in a GUI presented in theweb browser, e.g., an editor window.

Further Embodiments

In some embodiments, the method may include sending the edited GDFP to acomputer system for storage, compilation, analysis, or download by otherusers. In one embodiment, receiving the GDFP editor from the servercomputer over the network may include receiving a GDFP execution enginefrom the server computer over the network. The method may includesending the edited GDFP to the server computer for compilation, andreceiving an executable for the GDFP from the server computer (e.g.,generated via compilation on the server computer). The executable of theedited GDFP may then be executed in the web browser via the GDFPexecution engine. Thus, after compilation, the server may send theresulting executable back for execution, e.g., at the request of theuser via the web browser, or automatically.

In other embodiments, the GDFP editor may be included in a graphicalprogram development environment (GPDE), receiving the GDFP editor fromthe server computer over the network may include receive the GPDE fromthe server computer over the network. The GPDE may include a GDFPcompiler and a GDFP execution engine. The GDFP compiler may beexecutable in the web browser to compile the edited GDFP in the webbrowser, thereby generating an executable of the edited GDFP, and theGDFP execution engine may be executable in the web browser to executethe executable of the edited GDFP in the web browser.

In further embodiments, the GDFP execution engine is or includes aninterpreter, and executing the GDFP in the web browser may include theGDFP execution engine interpreting the GDFP. Thus, rather than compilingthe graphical source code of the GDFP to generate an executable, theGDFP execution engine may interpret the (graphical source code of the)GDFP at runtime, i.e., making a compiler unnecessary.

In some embodiments, the edited GDFP may be deployed to one or moretarget devices. For example, the graphical source code of the editedGDFP or the executable may be sent to a target device for execution. Inembodiments where the graphical source code is sent, the target devicemay be required to compile the program. The target device may bespecified by the user via the web browser.

FIG. 5B—Flowchart of a Method for Editing a Graphical Program over aNetwork Via a Web Browser—Server Side

FIG. 5B is a flowchart diagram illustrating one embodiment of a methodfor editing a graphical program over a network via a web browser, fromthe perspective of a server computer, e.g., computer 90, or anothercomputer. The method shown in FIG. 5B may be used in conjunction withany of the computer systems or devices shown in the above Figures, amongother devices. In various embodiments, some of the method elements shownmay be performed concurrently, in a different order than shown, or maybe omitted. Additional method elements may also be performed as desired.Descriptions of method elements described previously (e.g., with respectto other methods) may be abbreviated. As shown, this method may operateas follows.

In 522, a network connection may be established with a client computerover a network, and in 524, a universal resource identifier (URI) may bereceived from the client computer over the network, where the URIindicates a graphical data flow program (GDFP) or a graphical data flowprogram editor (GDFP editor) for creating or editing the GDFP. Note thatin some embodiments, method elements 522 and 524 may be performedtogether. For example, the user of the client computer may click on alink or may otherwise indicate the URI, which may automatically invokethe connection with the server computer.

In 526, the GDFP editor may be sent to the client computer over thenetwork in response to the URI. As described above, the GDFP editor maybe executable in a web browser to edit the GDFP. As also describedabove, the GDFP editor may be configured to execute in a sandbox, e.g.,a secure execution environment, e.g., implemented by, as, or via, aplugin. As described above, if the plugin is not already resident on theclient computer, the user may be directed (e.g., via a text message, alink, etc.) to a source from which the plugin may be downloaded.

Operation of the GDFP editor and additional aspects and features of themethod according to various embodiments are described above withreference to FIG. 5A, where, for example, features or attributeddescribed from the point of view of the client computer, may beconsidered from the perspective of the server computer. For example,instead of the client computer receiving the GDFP compiler or executionengine, as described above with respect to the method of FIG. 5A (clientside), in corresponding embodiments of the method of FIG. 5B (serverside), the server computer sends the GDFP compiler or execution engine.Similarly, whereas one embodiment of the method of FIG. 5A includes (theclient computer) sending the edited GDFP to the server computer forcompilation, and receiving an executable for the GDFP from the servercomputer, a corresponding embodiment from the server side may includereceiving the edited GDFP from the client computer for compilation,compiling the edited GDFP, thereby generating an executable for theedited GDFP, and sending the executable for the GDFP to the clientcomputer, and so forth. As also indicated above, in some embodiments,the GDFP execution engine is or includes an interpreter, and executingthe GDFP in the web browser includes the GDFP execution engineinterpreting the GDFP, making a compiler unnecessary.

In other words, some of the embodiments of the method of FIG. 5B may becomplementary with respect to corresponding embodiments of the method ofFIG. 5A. This pattern of paired methods covering client and serverfunctionality is repeated below with respect to other web-based methods.

Other embodiments of the server side method of FIG. 5B may include the(the server computer) receiving the edited GDFP from the clientcomputer, and deploying the edited GDFP to one or more target devices,e.g., as opposed to the client computer doing so.

Some client systems may not have the capability to execute the GDFP,e.g., may not include software that supports or includes theabove-mentioned sandbox or plugin, e.g., may not be capable of executingthe GDFP execution engine; but there still may be a need or desire toview such graphical programs. For example, client users may wish to viewthe above edited GDFP, even though they cannot execute it. Thus, in oneembodiment, the GDFP may have an associated representation implementedin a browser supported format, e.g., one or more of: HTML an imageformat, or PDF, among other browser supported/accessible formats, wherethe representation of the GDFP does not include the GDFP. In otherwords, the server may store not only the GDFP, but also may store adownloadable representation of the GDFP that may be viewable in a webbrowser. Thus, the representation of the GDFP may be downloadable toclient systems for display in browsers on the client systems, includingbrowsers that do not support execution of the GDFP. Moreover, therepresentation of the GDFP may be indexable for searching by searchengines, and so may be findable via web search technologies. In variousembodiments, the representation of the GDFP may include one or more ofcomments in the GDFP, an indication of components referenced by the GDFPwith links to the referenced components, or notes regarding the GDFP,among other items, e.g., metadata related to the program.

Accordingly, in some embodiments where the GDFP is edited andtransmitted back to the server, the method may further include receivingthe edited GDFP from the client system, and generating and storing suchan associated representation of the edited GDFP, i.e., where therepresentation of the edited GDFP does not include the edited GDFP, andwhere the representation of the GDFP is downloadable to client systemsfor display in browsers on the client systems, including browsers thatdo not support execution of the edited GDFP.

Described in a slightly different way, a memory medium, e.g., of or fora server computer, may store a graphical data flow program editor (GDFPeditor), where the GDFP editor is executable in a web browser on aclient system to display the graphical data flow program (GDFP) in theweb browser. User input may be received indicating one or more editoperations to be performed on the GDFP, and the GDFP may be edited inthe web browser in accordance with the one or more edit operations,thereby generating an edited GDFP, after which the edited GDFP may bedisplayed in the web browser. Moreover, the memory medium may storeprogram instructions executable by a processor to establish a networkconnection with a client computer over a network, receive a universalresource identifier (URI) from a client computer over the network, wherethe URI indicates the GDFP or the GDFP editor for creating or editingthe GDFP, and send the GDFP editor to the client computer over thenetwork for execution in the web browser of the client computer.

Thus, in one embodiment, a user may open a browser and access a URI at aserver, where the URI may reference the graphical program editor (withno existing graphical program), or the URI may reference a previouslycreated graphical program, along with its editor (or developmentenvironment. The server may provide a graphical data flow programdevelopment environment (GPDE), including a graphical data flow programeditor, and possibly an execution system. The user can create or edit agraphical program in the browser. The editor may thus be fully broughtclient side and run locally, e.g., in a sandbox on the client.

FIG. 6A—Flowchart of a Method for Executing a Graphical Data FlowProgram in a Web Browser—Client Side

FIG. 6A is a flowchart diagram illustrating one embodiment of a methodfor executing a graphical program over a network via a web browser, fromthe perspective of a client computer, e.g., computer 82, or anothercomputer. The method shown in FIG. 6A may be used in conjunction withany of the computer systems or devices shown in the above Figures, amongother devices. In various embodiments, some of the method elements shownmay be performed concurrently, in a different order than shown, or maybe omitted. Additional method elements may also be performed as desired.Note that for brevity, in all the methods presented herein, thedescriptions of method elements previously presented may be abbreviated.As shown, this method may operate as follows.

In 502, a network connection may be established with a server computerover a network, e.g., a user may open a web browser and direct thebrowser to the server computer.

In 604, a universal resource identifier (URI) may be sent to the servercomputer over the network, where the URI indicates a graphical data flowprogram (GDFP) or a GDFP execution engine for executing the GDFP. Inother words, the GDFP may require the GDFP execution engine to execute.Method elements 502 and 604 may be performed together, e.g., the user ofthe client computer may click on a link or may otherwise indicate theURI, which may automatically invoke the connection with the servercomputer.

In 606, the GDFP execution engine may be received from the servercomputer over the network in response to the URI. In one embodiment, theGDFP is a pre-existing GDFP, where the GDFP execution engine isassociated with the pre-existing GDFP, and where the URI specifies thepre-existing GDFP, thereby also indicating the associated GDFP executionengine, as discussed above with respect to the GDFP editor, where, forexample, the GDFP may also be received from the server computer inresponse to the URI (along with the GDFP execution engine), oralternatively, in embodiments where the GDFP is not a pre-existing GDFP,the URI may specify the GDFP execution engine, and the GDFP executionengine may be executable in the web browser to receive user inputspecifying creation of the GDFP, and create the GDFP in response to theuser input, i.e., the execution engine may include or be associated with(and received with) a GDFP editor.

In 608, the GDFP may be executed in a web browser via the GDFP executionengine. In other words, the GDFP execution engine may execute the GDFPwithin the web browser. In one embodiment, the method may includereceiving user input to the web browser invoking execution of the GDFP,and the GDFP may be executed in the browser in response to the receiveduser input.

In one embodiment, e.g., where the GDFP is not pre-existing, and theuser creates the program, the method may include sending the (created)GDFP to the server computer for compilation, and receiving an executablefor the GDFP from the server computer (e.g., generated via compilationon the server computer). Thus, after compilation, the server may sendthe resulting executable back for execution, e.g., at the request of theuser via the web browser, or automatically. Alternatively, the GDFPexecution engine may further include a compiler, e.g., as part of a GDFPdevelopment environment downloaded with the GDFP execution engine, andthe GDFP (in the form of graphical source code) may be compiled tocreate the executable. Thus, executing the GDFP in the web browser mayinclude the GDFP execution engine executing the executable of the GDFPin the web browser.

As described above with respect to the methods of FIGS. 5A and 5B, inother embodiments, the GDFP execution engine is or includes aninterpreter, and executing the GDFP in the web browser may include theGDFP execution engine interpreting the GDFP, and so rather thancompiling the graphical source code of the GDFP to generate anexecutable, the GDFP execution engine may interpret the (graphicalsource code of the) GDFP at runtime, i.e., making a compilerunnecessary.

In 610, an indication of executing the GDFP may be displayed in the webbrowser. For example, output from the program may be displayed in theweb browser, e.g., in a GUI, e.g., front panel, of the GDFP. Moregenerally, a graphical user interface (GUI) of the GDFP may be displayedin the web browser on a display, where the GUI may be configured todisplay results of the GDFP execution, or receive user input specifyinginput to the GDFP. For example, in embodiments where the GDFP is aLabVIEW graphical program (also referred to as a virtual instrument(VI)), the GUI may be a front panel with one or more controls andindicators for interacting with the program. For example, the frontpanel may be displayed in a window of the web browser, and may bedisplay output from and/or receive user input to the GDFP.

Further Embodiments

In some embodiments, depending on the application, the GDFP may utilizeother resources on the client computer, or networked to the clientcomputer, to perform its specified functionality. For example, executingthe GDFP in a web browser via the GDFP execution engine may includeaccessing one or more web services over the network, or invokingexecution of one or more programs or subprograms on other devices overthe network. Examples of such resources may include data sources for theprogram, e.g., data servers, libraries (possibly stored remotely), dataor program repositories, sensors, actuators, logs, and so forth, amongothers. The GDFP may be executable in the web browser via the GDFPexecution engine to communicate with the embedded device via sharedvariables, or web services, among other communication means. As notedabove, the GDFP may comprise a plurality of interconnected nodes thatvisually indicate the functionality of the program.

In one embodiment, receiving the GDFP from the server computer mayinclude receiving the GDFP graphical source code and an executable ofthe GDFP program. The GDFP, the GDFP execution engine may then executethe executable of the GDFP; and the graphical source code of the GDFPmay be displayed in the web browser on a display.

As with the above methods, the GDFP execution engine may be configuredto execute in a sandbox. As also described above in detail, in someembodiments, the sandbox may be implemented by a plugin, and soexecuting the GDFP in the sandbox may include the GDFP execution engineexecuting the GDFP in or via the plugin.

In one embodiment, the GDFP may be embedded in a web page, where the URIreferences the web page, thereby indicating the GDFP, and wherereceiving the GDFP execution engine from the server includes receivingthe web page from the server over the network, including the GDFP andthe GDFP execution engine. Executing the GDFP in a web browser via theGDFP execution engine may include displaying the web page on a display,and displaying results of executing the GDFP in the web page on thedisplay. Similarly, user input to the GDFP may include receiving userinput to the web page.

Thus, a developer may create the GDFP conventionally (via the standarddevelopment environment), or via any of the web browser-based techniquesdisclosed herein, e.g., where the development environment is retrievedfrom a server, e.g., via a URI. The user may embed the graphical dataflow program code via a webpage editor that may or may not be a part ofthe development environment, and may upload the webpage (file) to theserver or functional equivalent (e.g., a networked device operable tostore or host the webpage and an execution engine). Subsequently, a usermay access the server and request the webpage, e.g., via a URI, and theserver may provide the web page to the user's computer, including theembedded graphical data flow program, and an execution engine forexecuting the embedded graphical data flow program. The user may viewthe webpage and execute the graphical data flow program in a web browser(see, e.g., item 2 above). This technique may be particularly useful forpresenting demo software to prospective customers.

The GDFP execution engine may be or include a GDFP player, and executingthe GDFP in a web browser via the GDFP execution engine may includeexecuting the GDFP in a web browser via the GDFP player. In oneembodiment, the player is a program that provides for navigation andcontrol functions such as Run, Stop, Open Diagram (program) (perhaps inanother browser window), Rate (e.g., thumbs up/down), and, in someembodiments, additional information such as common branding (e.g.,“Built with LabVIEW”). In another embodiment, the play may also providereferences to similar programs (e.g., VIs), e.g., once the execution iscomplete. A player may not provide a secure execution environment, andthus is distinct from a sandbox.

By putting these functionalities in the player the users program may bemuch simpler. Two exemplary use scenarios are now described:

(1) Programs may be compiled into controls that can be embedded in a webpage. For example, if a user makes a program that is a simulation of aninverted pendulum then that (web application) program can be embedded ona web page directly, in which case it will have none of the extrafunctions disclosed above. This approach (where a player is not used)may be particularly useful when embedded on a thin client for machinecontrol. Alternatively a player may be embedded in the web page as aframe, and the simulation may in turn be embedded in the player, inwhich case the user gets all the community benefits of the functionsdescribed above with no additional work required.

(2) Programs that are not compiled into controls that can be directlyembedded into a webpage (e.g., simple subroutines, or classes). The usermay want to present a simple subroutine program. Since that program isnot compiled into a component that can be directly embedded in the webpage, the player provides a minimal shell that can invoke the user'sprogram.

In one embodiment, the GDFP (e.g., possibly with the GDFP executionengine) may be or include a graphical dataflow web application foranalysis and visualization of web-hosted data. Thus, for example,multiple instances of the GDFP and execution engine may be downloaded tomultiple client computers (executing respective web browsers), alongwith respective portions of a web-hosted data set, and may be executedin the respective web browsers of the client computers to analyze and/orvisualize the data and/or results from the analysis. The analysisresults may be transmitted back to the server (or another device) forstorage and/or provision to the other client computers. Further detailsregarding such distributed analysis of data is described below withreference to FIGS. 18A and 18B.

FIG. 6B—Flowchart of a Method for Editing a Graphical Program over aNetwork Via a Web Browser—Server Side

FIG. 6B is a flowchart diagram illustrating one embodiment of a methodfor executing a graphical program a web browser, but from theperspective of a server computer, e.g., computer 90, or anothercomputer. The method shown in FIG. 6B may be used in conjunction withany of the computer systems or devices shown in the above Figures, amongother devices. In various embodiments, some of the method elements shownmay be performed concurrently, in a different order than shown, or maybe omitted. Additional method elements may also be performed as desired.As shown, this method may operate as follows.

In 522, a network connection may be established with a client computerover a network, as described above with reference to the method of FIG.5B.

In 624, a universal resource identifier (URI) may be received from theclient computer over the network, where the URI indicates a graphicaldata flow program (GDFP) or a GDFP execution engine for executing theGDFP, where method elements 522 and 624 may be performed together, e.g.,the user of the client computer may click on a link or may otherwiseindicate the URI, which may automatically invoke the connection with theserver computer (or not). As noted above, the GDFP may include aplurality of interconnected nodes or icons which visually indicate thefunctionality of the program, and may require the GDFP execution engineto execute.

In 626, the GDFP execution engine may be sent to the client computerover the network in response to the URI. As described above, the GDFPexecution engine may be executable in a web browser. As also describedabove, the GDFP execution engine may be configured to execute in asandbox, e.g., a secure execution environment, possibly implemented asor by a plugin.

Moreover, as further described above, in various embodiments, the method(performed on or by program instructions executing on the servercomputer) may include sending the GDFP to the client computer, which mayinclude sending graphical source code for the GDFP and/or sending anexecutable of the GDFP to the client computer, or, in embodiments wherethe GDFP is embedded in a web page, may include sending the web page tothe client computer.

The nature and operation of the GDFP execution engine according tovarious embodiments are described above with reference to FIG. 6A,where, executing the GDFP in the web browser includes displaying anindication of executing the GDFP in the web browser. Moreover, any ofthe features and techniques described above with respect to the methodsof FIGS. 5A and 5B (regarding the GDFP editor) may be applied to theGDFP execution engine-related methods of FIGS. 6A and 6B, as notedabove. More generally, any of the features and techniques disclosedherein may be used with respect to any of the methods described herein.

FIG. 7A—Flowchart of a Method for Statically Analyzing a GraphicalProgram over a Network Via a Web Browser—Client Side

FIG. 7A is a flowchart diagram illustrating one embodiment of a methodfor statically analyzing (i.e., at edit (or compile) time) a graphicalprogram (GP) via a web browser, from the perspective of a clientcomputer, e.g., computer 82, or another computer. The method shown inFIG. 7A may be used in conjunction with any of the computer systems ordevices shown in the above Figures, among other devices. In variousembodiments, some of the method elements shown may be performedconcurrently, in a different order than shown, or may be omitted.Additional method elements may also be performed as desired. As shown,this method may operate as follows.

In 502, a network connection may be established with a server computerover a network, e.g., a user may open a web browser and direct thebrowser to the server computer.

In 704, a universal resource identifier (URI) may be sent to the servercomputer over the network, where the URI indicates a GP or a graphicalprogram analyzer or debugger for analyzing GPs, which in someembodiments may be or include an editor (GP editor) for creating,editing, and analyzing the GP. Similar to above, method elements 502 and704 may (or may not) be performed together, e.g., the user of the clientcomputer may click on a link or may otherwise indicate the URI, whichmay automatically invoke the connection with the server computer.

In 706, the GP analyzer may be received from the server computer overthe network in response to the URI. The GP may be a pre-existing GP,where the GP analyzer is associated with the pre-existing GP, and wherethe URI specifies the pre-existing GP, thereby also indicating theassociated GP analyzer. In this embodiment, the GP may also be receivedfrom the server computer in response to the URI. Alternatively, inembodiments where the GP is not a pre-existing GP, the URI may specifythe GP analyzer, which, as indicated above, may be or include a GPeditor, and the GP analyzer may be executable in the web browser toreceive user input specifying creation of the GP, and create and editthe GP in response to the user input.

In 708, the GP analyzer may be executed in a web browser, e.g., in asandbox, i.e., a secure execution environment. Executing the GP analyzerin the web browser may thus occur in the sandbox, thus preventinginterference from or interfering with other programs executing on the(client) computer. As described above in detail, in some embodiments,the sandbox may be implemented by a plugin, and so executing the GDFP inthe sandbox may include the GDFP execution engine executing the GDFP inor via the plugin. Note that in some embodiments, the analyzer may beexecuted within the web browser as part of editor functionality, e.g.,as part of the editing or development process.

In 710, the GP may be displayed in the web browser, e.g., via the GPanalyzer, where the GP comprises a plurality of interconnected nodes oricons which visually indicate the functionality of the program. Forexample, a GUI, e.g., a window, may be displayed in the web browser, andthe GP may be displayed in the GUI. Note that in embodiments where theGP analyzer includes a GP editor, the GP may be displayed in an editorwindow in the web browser. An exemplary graphical program is illustratedin FIG. 21.

In some embodiments, the graphical program may be or include a graphicaldata flow program (GDFP), i.e., may have an architecture and behavior inaccordance with a data flow model of computation. Accordingly, in suchembodiments, the analyzer may be or include a graphical data flowprogram analyzer (and/or editor).

In 712, the GP may be analyzed in the web browser via the GP analyzer,and results of analyzing the GP may be displayed in the web browser, asindicated in 714. For example, the GP analyzer may analyze the GPgraphical source code, including, for example, performing typepropagation in the GP, constant folding in the GP, validation of codingconventions, or complexity analysis, among other aspects of the GPgraphical source code.

It should be noted that in the method of FIGS. 7A and 7B, the analysisreferred to is static analysis, e.g., performed at edit and/or compiletime. In other words, the analysis may be performed on or with respectto the source code of the GP, not with respect to its behavior duringexecution, referred to as dynamic analysis, which is discussed belowwith reference to FIGS. 8A and 8B. Similar to the display of the GPitself (710), the analysis results may be displayed in a GUI, e.g., awindow, in the web browser.

In various embodiments, the results of analyzing the GP may be storedlocally, and/or may be sent to the server or another device over thenetwork for storage, analysis, or use by other users.

Further Embodiments

As noted above, in some embodiments, the GP analyzer may be or include aGP editor. The GP editor may be executable in the web browser to displaythe GP in the web browser, receive user input to the GP editor executingin the web browser, where the user input indicates one or more editoperations to be performed on the GP, and edit the GP in the web browserin accordance with the one or more edit operations, thereby generatingan edited GP, which may be displayed in the web browser. The GPeditor/analyzer may analyze the edited GP. The editing and analyzing maybe performed multiple times in an iterative manner, e.g., to debug theprogram. Analysis results may be transmitted back to the server (oranother device) for storage and/or provision to the other clientcomputers.

In one embodiment, receiving the GP analyzer from the server computerover the network may include receiving a GP execution engine from theserver computer over the network, i.e., the GP analyzer may also be orinclude a GP execution engine. The method may include sending the editedGP to the server computer for compilation, in response to which anexecutable for the GP may be received from the server computer, and theexecutable of the edited GP may be executed in the web browser via theGP execution engine.

Alternatively, the GP analyzer may be included in a graphical programdevelopment environment (GPDE), and receiving the GP analyzer from theserver computer over the network may include receiving the GPDE from theserver computer over the network, where the GPDE includes a GDFPcompiler and a GP execution engine (e.g., and a GP editor). The GPcompiler may be executable in the web browser to compile the edited GPin the web browser, thereby generating an executable of the edited GP,and the GP execution engine may execute the executable of the edited GPin the web browser.

Alternatively, in some embodiments, the GPDE or GP execution engine isor includes an interpreter, and executing the GP (and/or the edited GP)in the web browser includes the GP execution engine interpreting the GP(and/or the edited GP).

FIG. 7B—Flowchart of a Method for Statically Analyzing a GraphicalProgram over a Network Via a Web Browser—Server Side

FIG. 7B is a flowchart diagram illustrating one embodiment of a methodfor statically analyzing a graphical program over a network via a webbrowser, from the perspective of a server computer, e.g., computer 90,or another computer. The method shown in FIG. 7B may be used inconjunction with any of the computer systems or devices shown in theabove Figures, among other devices. In various embodiments, some of themethod elements shown may be performed concurrently, in a differentorder than shown, or may be omitted. Additional method elements may alsobe performed as desired. As shown, this method may operate as follows.

In 522, a network connection may be established with a client computerover a network, and in 724, a universal resource identifier (URI) may bereceived from the client computer over the network, where the URIindicates a graphical program (GP) or a graphical program analyzer (GPanalyzer) for creating or editing the GP, where, as noted above, the GPmay comprise a plurality of interconnected nodes or icons which visuallyindicate the functionality of the program. Note that in someembodiments, method elements 522 and 724 may be performed together. Forexample, the user of the client computer may click on a link or mayotherwise indicate the URI, which may automatically invoke theconnection with the server computer.

In 726, the GP analyzer may be sent to the client computer over thenetwork in response to the URI. As described above, the GP analyzer maybe executable in a web browser to statically analyze a graphicalprogram.

The nature and operation of the GP analyzer according to variousembodiments are described above with reference to FIG. 7A. For example,as described above, the GP analyzer may be configured to execute in asandbox, i.e., a secure execution environment, possibly implemented by aplugin, and so analyzing the GDFP in the sandbox may include the GDFPanalyzer analyzing the GDFP in or via the plugin. Moreover, as alsodiscussed above, in various embodiments, the method (performed on or byprogram instructions executing on the server computer) may includesending the GP to the client computer, which may include sendinggraphical source code for the GP and/or sending a GP editor, compiler,and/or execution engine (which may be or include an interpreter), to theclient computer; or, in embodiments where the GP is edited on the clientside, the method (performed by program instructions executed on or bythe server computer) may receive and compile the edited GP, and send anexecutable back to the client computer for execution in the browser. Asfurther described above, the server computer may also receive analysisresults from the client computer over the network, e.g., for storage,analysis, or use by other users, as desired.

Thus, in one embodiment, a user may open a browser and access a URI at aserver, where the URI may reference the graphical program editor (withno existing graphical program), or the URI may reference a previouslycreated graphical program, e.g., a graphical data flow program, alongwith its editor (or development environment. The server may provide agraphical program development environment (GPDE), e.g., a graphical dataflow program development environment, including a graphical programeditor whereby the user can create or edit a graphical program in thebrowser, and possibly an execution system for executing the program. Theeditor may thus be fully brought client side and run locally, e.g., asandbox, e.g., a plugin, on the client.

Thus, for a graphical program being created/edited in a web browser, theanalyzer, or suitably functional editor, may perform various edit time(and/or compile time) analyses, including any of various types ofinternal analysis of the graphical program desired. Further embodimentsand details regarding functions and attributes of the server computerand its software are described above with respect to the method of FIG.7A, and which are not repeated here for brevity, since the server sidemethod may be considered to be complementary to the client side method,as is the case with all the methods disclosed herein.

FIG. 8A—Flowchart of a Method for Dynamically Analyzing a GraphicalProgram in a Web Browser

FIG. 8A is a flowchart diagram illustrating one embodiment of a methodfor executing and dynamically analyzing a graphical program over anetwork via a web browser, from the perspective of a client computer,e.g., computer 82, or another computer. The method shown in FIG. 8A maybe used in conjunction with any of the computer systems or devices shownin the above Figures, among other devices. In various embodiments, someof the method elements shown may be performed concurrently, in adifferent order than shown, or may be omitted. Additional methodelements may also be performed as desired. As shown, this method mayoperate as follows.

In 502, a network connection may be established with a server computerover a network, e.g., a user may open a web browser and direct thebrowser to the server computer.

In 804, a universal resource identifier (URI) may be sent to the servercomputer over the network, where the URI indicates a graphical program(GP) or a GP execution engine for executing and analyzing the(executing) GP, i.e., dynamically. In other words, the GP may requirethe GP execution engine to execute, and may be dynamically analyzed viathe GP execution engine. Thus, the GP execution engine may be or includea GP dynamic analyzer. Method elements 502 and 804 may be performedtogether, e.g., the user of the client computer may click on a link ormay otherwise indicate the URI, which may automatically invoke theconnection with the server computer. As with methods 7A and 7B above,the GP may include a plurality of interconnected nodes that visuallyindicate functionality of the program, and in some embodiments, may beor include a graphical data flow program, i.e., may have an architectureand behavior in accordance with a data flow model of computation,although any other types of graphical programs may be used as desired.

In 806, the GP execution engine may be received from the server computerover the network in response to the URI. In one embodiment, the GP is apre-existing GP, where the GP execution engine is associated with thepre-existing GP, and where the URI specifies the pre-existing GP,thereby also indicating the associated GP execution engine, similar tothe method of FIGS. 6A and 6B, where, for example, the GP may also bereceived from the server computer in response to the URI, oralternatively, in embodiments where the GP is not a pre-existing GP, theURI may specify the GP execution engine, and the GP execution engine maybe executable in the web browser to receive user input specifyingcreation of the GP, and create (and edit) the GP in response to the userinput, i.e., the execution engine may include or be associated with a GPeditor (and in some embodiments, a GP compiler or interpreter).

In 808, the GP may be executed and dynamically analyzed in a web browservia the GP execution engine, i.e., the GP execution engine may analyzethe GP during execution. In other words, the GP execution engine mayexecute the GP within the web browser, and analyze the GP duringexecution, e.g., dynamically. Analyzing the GP during execution mayinclude analyzing one or more of: performance of the executing GP,usability of the executing GP, execution speed of the GP, numericaloverflow and underflow during execution of the GP, code coverage of theGP, utilization of multiple cores in executing the GP, or exceptionsraised by subcomponents of the GP, among other aspects of the GPexecution. In one embodiment, the method may include receiving userinput to the web browser invoking execution of the GP, and the GP may beexecuted and dynamically analyzed in the browser in response to thereceived user input.

In 810, results of analyzing the GP may be displayed in the web browser.For example, output from dynamically analyzing the program may bedisplayed in a GUI displayed in the web browser. The analysis resultsmay be stored locally, and/or may be transmitted back to the server (oranother device) for storage and/or provision to the other clientcomputers.

Further Embodiments

As with the above-described methods, in some embodiments, the GP is apre-existing GP, e.g., stored on the server computer (or on a computercoupled to the server computer). The GP execution engine/dynamicanalyzer may be associated with the pre-existing GP. The URI may specifythe pre-existing GP, thereby also indicating the associated GP executionengine/dynamic analyzer, and the GP may be received from the servercomputer in response to the URI, e.g., in 806, along with the GPexecution engine.

In one embodiment, receiving the GP from the server computer may includereceiving the GP graphical source code and an executable of the GPprogram. The GP execution engine may then execute the executable of theGP; and the graphical source code of the GP may be displayed in the webbrowser on a display. Alternatively, the GP execution engine may furtherinclude a GP editor and/or compiler, e.g., as part of a GP developmentenvironment downloaded with the GP execution engine, and the GPgraphical source code may be edited (and displayed) via the GP editor,and/or compiled to create the executable.

In embodiments where the GP is not a pre-existing GP, the URI mayspecify the GP execution engine (which may include the GP editor), theGP editor may be executable in the web browser to receive user inputspecifying creation of the GP, and to create the GP in response to theuser input.

More generally, the GP execution engine may include a GP editor that isexecutable in the web browser to display the GP in the web browser,receive user input to the GP editor (e.g., the GP execution engineoperating as a GP editor) executing in the web browser, where the userinput indicates one or more edit operations to be performed on the GP,and to edit the GP in the web browser in accordance with the one or moreedit operations, thereby generating an edited GP. The edited GP sourcecode may be displayed in the web browser, and the GP execution enginemay compile, execute, and analyze (and possibly optimize) the edited GPin the web browser.

Alternatively, the edited GP may be sent to the server computer forcompilation, and an executable for the GP may be received from theserver computer. The GP execution engine may be configured to executeand analyze the executable of the edited GP in the web browser.

Alternatively, in some embodiments, the GPDE or GP execution engine maybe or include an interpreter, and executing the GP in the web browsermay include the GP execution engine interpreting the GP.

As with the above methods, the GP execution engine may be configured toexecute in a sandbox, e.g., implemented as or by a plugin, i.e., the GPexecution engine may execute the GP in the sandbox.

FIG. 8B—Flowchart of a Method for Dynamically Analyzing a GraphicalProgram over a Network Via a Web Browser—Server Side

FIG. 8B is a flowchart diagram illustrating one embodiment of a methodfor executing and dynamically analyzing a graphical program a webbrowser, but from the perspective of a server computer, e.g., computer90, or another computer. The method shown in FIG. 8B may be used inconjunction with any of the computer systems or devices shown in theabove Figures, among other devices. In various embodiments, some of themethod elements shown may be performed concurrently, in a differentorder than shown, or may be omitted. Additional method elements may alsobe performed as desired. As shown, this method may operate as follows.

In 522, a network connection may be established with a client computerover a network.

In 824, a universal resource identifier (URI) may be received from theclient computer over the network, where the URI indicates a graphicalprogram (GP) or a GP execution engine for executing the GP, where methodelements 522 and 824 may be performed together, e.g., the user of theclient computer may click on a link or may otherwise indicate the URI,which may automatically invoke the connection with the server computer(or not). As noted above, the GP may include a plurality ofinterconnected nodes or icons which visually indicate the functionalityof the program, and may require the GP execution engine to execute. Insome embodiments, the graphical program may be or include a graphicaldata flow program.

In 826, the GP execution engine may be sent to the client computer overthe network in response to the URI. As described above, the GP executionengine may be executable in a web browser, and may be configured toexecute in a sandbox, e.g., a secure execution environment, which insome embodiments may be implemented as or by a plugin. For example, asindicated above, in embodiments where the GP is a pre-existing GP, theGP execution engine may be associated with the pre-existing GP, and theURI may specify the pre-existing GP, thereby also indicating theassociated GP execution engine, in which case the GP may be sent to theclient computer in response to the URI. Alternatively, in embodimentswhere the GP is not a pre-existing GP, the URI may specify the GPexecution engine, which may include a GP editor executable in the webbrowser to receive user input specifying creation of the GP, and createthe GP in response to the user input.

As also indicated above, in some embodiments, the created GP may bereceived from the client computer over the network, and compiled togenerate an executable of the GP, which may be sent to the clientcomputer over the network. Alternatively, the GP execution engine mayinclude a compiler that is executable in the web browser to compile thecreated GP in the web browser (on the client computer), therebygenerating an executable of the created GP, where the GP executionengine being executable in the web browser to execute the GP includesthe GP execution engine being executable in the web browser to executethe executable of the created GP. Alternatively, as described above, insome embodiments, the GPDE or GP execution engine may be or include aninterpreter, and so executing the GP in the web browser may include theGP execution engine interpreting the GP.

Operation of the GP execution engine according to various embodiments isdescribed above with reference to FIG. 8A, where, executing the GP inthe web browser includes the GP execution engine dynamically analyzingthe GP in the web browser, and displaying results of analyzing the GP inthe web browser. For example, the GP execution engine may include a GPeditor executable in the web browser to display the GP in the webbrowser (where the GP comprises a plurality of interconnected nodes oricons which visually indicate the functionality of the program), receiveuser input to the GP editor executing in the web browser, where the userinput indicates one or more edit operations to be performed on the GP,edit the GP in the web browser in accordance with the one or more editoperations, thereby generating an edited GP, and display the edited GPsource code in the web browser. The GP execution engine may be furtherexecutable in the web browser to compile, execute, and analyze (andpossibly optimize) the edited GP, or, alternatively, the method mayinclude receiving the edited GP from the client computer forcompilation, compiling the edited GP, thereby generating an executablefor the GP, and sending the executable for the GP to the clientcomputer. The GP execution engine may be configured to execute andanalyze the executable of the edited GP in the web browser.Alternatively, as noted above, in some embodiments, the GPDE or GPexecution engine may be or include an interpreter, and executing the GPin the web browser may include the GP execution engine interpreting theGP, thus rendering compilation unnecessary.

Further embodiments and details regarding functions and attributes ofthe server computer and its software are described above with respect tothe method of FIG. 8A, and which are not repeated here for brevity,since the server side method may be considered to be complementary tothe client side method, as is the case with all the methods disclosedherein.

In some embodiments, a more general method of client side web hostedprogram development may be implemented, e.g., utilizing a client sideweb hosted program development environment, as described with respect toFIGS. 9A and 9B.

FIG. 9A—Flowchart of a Method for Developing a Program in a Web-HostedProgram Development Environment—Client Side

FIG. 9A is a flowchart diagram illustrating one embodiment of a methodfor developing a program over a network via a web browser, from theperspective of a client computer, e.g., computer 82, or anothercomputer. The method shown in FIG. 9A may be used in conjunction withany of the computer systems or devices shown in the above Figures, amongother devices. In various embodiments, some of the method elements shownmay be performed concurrently, in a different order than shown, or maybe omitted. Additional method elements may also be performed as desired.As shown, this method may operate as follows.

In 502, a network connection may be established with a server computerover a network, as described above.

In 904, a universal resource identifier (URI) may be sent to the servercomputer over the network, where the URI indicates a program or anintegrated development environment (IDE).

In 906, the IDE may be received from the server computer over thenetwork in response to the URI. The IDE may be executable in a webbrowser to create, edit, compile or interpret, execute, and debug (andpossibly optimize) programs in the web browser, via any of thetechniques described herein, as applied more generally to programs thatmay textual, graphical, data flow, and/or graphical data flow programs,as desired. Thus, in some embodiments, the program may be or include agraphical program (GP), and the IDE may be or include a graphicalprogram development environment (GPDE). In other embodiments, thegraphical program may be or include a graphical data flow program(GDFP), and the IDE may be a graphical data flow program developmentenvironment (GDFPDE). The IDE may include an editor, edit-time analyzer,compiler, execution engine (which may be or include an interpreter),and/or dynamic analyzer/debugger, and thus, may be referred to as aneditor, a static analyzer, a compiler, an execution engine (and/orinterpreter), and/or a dynamic analyzer or debugger, depending on thefunctionality being considered. In some embodiments, the IDE may befurther executable to automatically parallelize one or more portions ofthe graphical program in response to analyzing the program, and/orotherwise optimize the program.

Further Embodiments

In one embodiment, the program is a pre-existing program, where the IDEis associated with the pre-existing program, and where the URI specifiesthe pre-existing program, thereby also indicating the associated IDE,where, for example, the program may also be received from the servercomputer in response to the URI, or alternatively, in embodiments wherethe program is not a pre-existing program, the URI may specify the IDE,and the IDE may be executable in the web browser to receive user inputspecifying creation of the program, and create (and edit) the program inresponse to the user input.

As with the above methods, the IDE may be configured to execute in asandbox, i.e., a secure execution environment, possibly implemented by aplugin, and so creating, editing, compiling or interpreting, executing,and debugging programs in the web browser may include editing, compilingor interpreting, executing, and debugging programs in or by the plugin.

The IDE may be executable in the web browser to perform variousfunctions for developing the program. For example, in one embodiment,the IDE is executable in the web browser to display the program in theweb browser, receive user input indicating one or more edit operationsto be performed on the program, edit the program in the web browser inaccordance with the one or more edit operations, thereby generating anedited program, display the edited program (e.g., edited source code) inthe web browser, and compile or interpret, execute, and analyze (andpossibly optimize) the edited program.

Note that in various embodiments, the IDE may be configured tostatically analyze the program at edit time, and/or to dynamicallyanalyze the program at run time, i.e., during execution.

FIG. 9B—Flowchart of a Method for Developing a Program in a Web-HostedProgram Development Environment—Server Side

FIG. 9B is a flowchart diagram illustrating one embodiment of a methodfor developing a program over a network via a web browser, but from theperspective of a server computer, e.g., computer 90, or anothercomputer. The method shown in FIG. 9B may be used in conjunction withany of the computer systems or devices shown in the above Figures, amongother devices. In various embodiments, some of the method elements shownmay be performed concurrently, in a different order than shown, or maybe omitted. Additional method elements may also be performed as desired.As shown, this method may operate as follows.

In 522, a network connection may be established with a client computerover a network.

In 924, a universal resource identifier (URI) may be received from theclient computer over the network, where the URI indicates a program oran IDE, where method elements 522 and 924 may or may not be performedtogether.

In 926, the IDE may be sent to the client computer over the network inresponse to the URI. As described above, the IDE may be executable in aweb browser (e.g., in a sandbox, possibly implemented as a plugin). Asalso described above with reference to FIG. 9A, the IDE may beexecutable in a web browser of the client computer to create, edit,compile or interpret, execute, and/or analyze/debug (and possiblyoptimize) programs in the web browser. For example, similar to themethods described above, in embodiments where the program is apre-existing program, the IDE may be associated with the pre-existingprogram, and the URI may specify the pre-existing program, thereby alsoindicating the associated IDE, and the program may be sent to the clientcomputer in response to the URI. Alternatively, in embodiments where theprogram is not a pre-existing program, the URI may specify the IDE, andthe IDE may be executable in the web browser to receive user inputspecifying creation of the program, and create the program in responseto the user input.

Further details of the nature and operation of the IDE are disclosedabove with reference to the method of FIG. 9A.

Thus, an integrated development environment may be provided that isfully client side and web hosted, with editing, debugging andcompilation or interpretation capabilities. In other words, the IDE maybe deployed as a fully client side web hosted application, and mayimplement any of the features and techniques disclosed herein. Moreover,the server computer may include program instructions implementing any ofthe server-side methods and functions disclosed herein.

Hosting a Graphical Program Execution Engine on an Embedded Device

In some embodiments, various of the above techniques may also beutilized with respect to embedded devices, as described below withreference to FIGS. 10A and 10B, and 11A and 11B. More specifically,methods may be directed to hosting a graphical program/execution system(GPES) or development environment (GPDE) in or on an embedded device.

FIG. 10A—Flowchart of a Method for Monitoring or Controlling an EmbeddedDevice—Client Side

FIG. 10A is a flowchart diagram illustrating one embodiment of a methodfor monitoring or controlling an embedded device over a network via aweb browser, from the perspective of a client computer, e.g., computer82, or another computer. The method shown in FIG. 10A may be used inconjunction with any of the computer systems or devices shown in theabove Figures, among other devices. In various embodiments, some of themethod elements shown may be performed concurrently, in a differentorder than shown, or may be omitted. Additional method elements may alsobe performed as desired. As shown, this method may operate as follows.

In 1002, a network connection may be established with an embedded deviceover a network via a universal resource identifier (URI) associated withthe embedded device, e.g., a user may open a web browser and direct thebrowser to the embedded device. The embedded device may store agraphical program (GP) and a graphical program execution engine (GPEE),where the GP requires the GPEE to execute.

In one embodiment, the URI specifies the GP, thereby also indicating theassociated GPEE, while in another embodiment, the URI specifies theGPEE, and the associated GP is automatically indicated as a result. Inyet another embodiment, the URI may simply specify the embedded device,and the GPEE and associated GP are automatically indicated via theirassociation with the embedded device.

The embedded device may include a web server, e.g., may be configured tostore and serve web pages and/or other web content over a network. Theembedded device may include limited display capabilities, or may noteven include a display, i.e., may be “headless”, in that the device maynot include a monitor or other display capabilities.

As noted above, the GP may include a plurality of interconnected nodesthat visually indicate functionality of the program, and in someembodiments, the graphical program may be or include a graphical dataflow program (GDFP), and the GP execution engine may be or include agraphical data flow program execution engine (GDFPEE), or a graphicaldata flow development environment (GDFDE). More generally, in someembodiments, the GP execution engine may be or be included in aninteractive development environment (IDE), which may be executable inthe web browser to create, edit, analyze/debug, compile or interpret,optimize, and/or execute the GP.

In 1004, the GP execution engine and the GP may be received from theembedded device over the network in response to the URI.

In 1006, the GP may be executed in a web browser via the GP executionengine to control the embedded device in response to user input to theGP executing in the web browser, or to monitor activity or performanceof the embedded device, including analyzing and displaying output fromthe embedded device in the web browser, e.g., in a GUI displayed in theweb browser. Note that in some embodiments, the development environmentor GP execution engine may be or include an interpreter, and executingthe GP in the web browser may include the GP execution engineinterpreting the GP.

As with the above methods, the GP execution engine may be configured toexecute in a sandbox. As also described above in detail, in someembodiments, the sandbox may be implemented by a plugin, and soexecuting the GP in the sandbox may include the GP execution engineexecuting the GP in or via the plugin.

Moreover, depending on the application, the GP may utilize otherresources on the client computer, or networked to the client computer,to perform its specified functionality, e.g., executing the GP in a webbrowser via the GP execution engine may include accessing one or moreweb services over the network, or invoking execution of one or moreprograms or subprograms on other devices over the network. Examples ofsuch resources may include data sources for the program, e.g., dataservers, libraries (possibly stored remotely), data or programrepositories, sensors, actuators, logs, and so forth, among others.

Summarizing the above, in one embodiment, a user can use a web browserto access a URI on the embedded device, which may cause the embeddeddevice to provide a graphical program and an execution system to theuser's browser. The graphical program may execute in the user's browser,where the graphical program execution enables the user to interact with(monitor or control) the embedded device in some fashion, e.g., throughweb services or shared variables; i.e., execution of the graphicalprogram causes the graphical program to manipulate properties orsettings of the device, e.g., may cause the device to begin acquiringdata or supply acquired data, perform desired operations, etc.

Further Embodiments

In some embodiments, to monitor or control the embedded device inresponse to user input to the GP executing in the web browser, the GPmay be executable to send commands to the embedded device over thenetwork in response to the user input. The GP may be executable in theweb browser via the GP execution engine to access one or more webservices over the network, or to invoke execution of one or moreprograms or subprograms on other devices over the network. In oneembodiment, the GP may be executable in the web browser via the GPexecution engine to communicate with the embedded device via sharedvariables, or web services, among other communication means.

The embedded device itself may be coupled to one or more other devicesover the network, and may be configured to perform a task using the oneor more devices. The embedded device is configured to perform one ormore of a measurement task, a control task, a simulation task, or anautomation task, among others, as desired. Examples of measurement taskscontemplated include data acquisition, and data analysis, among others.In further embodiments, the embedded device may be configured to performany tasks desired.

In some embodiments, executing the GP in a web browser via the GPexecution engine includes displaying a graphical user interface (GUI)e.g., a front panel, of the GP in the web browser on a display, wherethe GUI is configured to display results of the GP execution, and/orreceive user input specifying input to the GP.

Similar to the above described methods, in one embodiment, the GP may beembedded in a web page, where the URI references the web page, therebyindicating the GP. Thus, receiving the GP execution engine from theembedded device over the network in response to the URI may includereceiving the web page from the embedded device over the network,including the GP and the GP execution engine. Executing the GP in a webbrowser via the GP execution engine may then include displaying the webpage on a display, and displaying results of executing the GP in the webpage on the display.

Additionally, in one embodiment, the embedded device may also store agraphical program editor/execution engine (GPEEE), and the method mayinclude receiving the GPEEE from the embedded device over the network inresponse to the URI, and executing the GPEEE in the web browser todisplay the GP in the web browser, receive user input indicating one ormore edit operations to be performed on the GP, edit the GP in the webbrowser in accordance with the one or more edit operations, therebygenerating an edited GP, and display the edited GP source code in theweb browser. Moreover, the GPEEE may be further executable in the webbrowser to compile or interpret, execute, and/or debug the edited GP inthe web browser. The method may then further include deploying theedited GP to the embedded device, and the edited GP may be executable toperform updated one or more functions.

Subsequently, the edited GP may be downloadable from the embedded deviceand executable by client computers to control the embedded device inresponse to user input to the GP executing in web browsers of the clientcomputers, or to monitor activity or performance of the embedded device,including analyzing and displaying output from the embedded device inthe web browsers of the client computers.

FIG. 10B—Flowchart of a Method for Monitoring or Controlling an EmbeddedDevice—Embedded Device Side

FIG. 10B is a flowchart diagram illustrating one embodiment of a methodfor monitoring or controlling an embedded device over a network via aweb browser, from the perspective of an embedded device with web serverfunctionality. The method shown in FIG. 10B may be used in conjunctionwith any of the computer systems or devices shown in the above Figures,among other devices. In various embodiments, some of the method elementsshown may be performed concurrently, in a different order than shown, ormay be omitted. Additional method elements may also be performed asdesired. As shown, this method may operate as follows.

In 1022, a network connection may be established with a client computerover a network, i.e., between the client computer and the embeddeddevice, via a universal resource identifier (URI) associated with theembedded device, e.g., the user of the client computer may click on alink or may otherwise indicate the URI, which may automatically invokethe connection with the embedded device (or not). As noted above, the GPmay require the GP execution engine to execute, and may be executable bythe embedded device to perform one or more functions.

Thus, the embedded device may store the graphical program (GP) and theGP execution engine for executing the GP, where the GP and the GPexecution engine may be accessible to a client computer via a URI. Forexample, in one embodiment, the URI specifies the GP, thereby alsoindicating the associated GPEE, while in another embodiment, the URIspecifies the GPEE, and the associated GP is automatically indicated asa result. In yet another embodiment, the URI may simply specify theembedded device, and the GPEE and associated GP are automaticallyindicated via their association with the embedded device.

The embedded device may include a web server, e.g., may be configured tostore and serve web pages and/or other web content over a network. Theembedded device may include limited display capabilities, or may noteven include a display, i.e., may be “headless”, in that the device maynot include a monitor or other display capabilities.

As noted above, the GP may include a plurality of interconnected nodesthat visually indicate functionality of the program, and in someembodiments, the graphical program may be or include a graphical dataflow program (GDFP), and the GP execution engine may be or include agraphical data flow program execution engine (GDFPEE), or a graphicaldata flow development environment (GDFE). More generally, in someembodiments, the GP execution engine may be or be included in aninteractive development environment (IDE), which may be executable inthe web browser to create, edit, analyze/debug, compile or interpret,optimize, and/or execute the GP.

In 1026, the GP execution engine may be sent to the client computer overthe network in response to the URI. As described above, the GP executionengine may be executable in a web browser to control the embedded devicein response to user input to the GP executing in the web browser, and/orto monitor activity or performance of the embedded device, includinganalyzing and displaying output from the embedded device in the webbrowser. As also described above, the GP execution engine may beconfigured to execute in a sandbox, e.g., a secure executionenvironment, which may be implemented by or as a plugin.

Operation of the GP execution engine is described above with referenceto FIG. 10A. Moreover, various of the above-described client sidefunctionalities imply corresponding embedded device side functions. Forexample, in correspondence with the client computer sending commands tothe embedded device over the network in response to the user input tocontrol the embedded device, the method may include (the embeddeddevice) receiving the commands, and configuring the embedded device tooperate in accordance with the commands.

Further details of the nature and operation of the embedded device andrelated software are disclosed above with reference to the method ofFIG. 10A.

FIG. 11A—Flowchart of a Method for Updating an Embedded Device

FIG. 11A is a flowchart diagram illustrating one embodiment of a methodfor updating an embedded device over a network via a web browser, fromthe perspective of a client computer, e.g., computer 82, or anothercomputer. The method shown in FIG. 11A may be used in conjunction withany of the computer systems or devices shown in the above Figures, amongother devices. In various embodiments, some of the method elements shownmay be performed concurrently, in a different order than shown, or maybe omitted. Additional method elements may also be performed as desired.As shown, this method may operate as follows.

In 1102, a network connection may be established with an embedded deviceover a network via a universal resource identifier (URI) associated withthe embedded device, e.g., a user may open a web browser and direct thebrowser to the embedded device. The embedded device may store agraphical program (GP) and a graphical program editor/execution engine(GPEEE).

The embedded device may be or include a web server, e.g., may beconfigured to store and serve web pages and/or other web content over anetwork, and may store a graphical program (GP), e.g., an embeddeddevice application, that the embedded device executes to perform one ormore functions, as well as a graphical program editor/execution engine(GPEEE). In other words, the GP may require the GPEEE to execute, andmay also be edited in the GPEEE. In various embodiments, the embeddeddevice may be configured to execute the GP to perform a measurementtask, a control task, a simulation task, or an automation task, amongothers.

As noted above, the embedded device may not include a display, i.e., maybe “headless”, in that the device may not include a monitor or otherdisplay capabilities. As noted above, the GP may include a plurality ofinterconnected nodes that visually indicate functionality of theprogram, and in some embodiments, the graphical program may be orinclude a graphical data flow program, and the GPEEE may be or include agraphical data flow program development environment (GDFPDE).

In one embodiment, the URI specifies the GP, thereby also indicating theassociated GPEEE, while in another embodiment, the URI specifies theGPEEE, and the associated GP is automatically indicated as a result. Inyet another embodiment, the URI may simply specify the embedded device,and the GPEEE and associated GP are automatically indicated via theirassociation with the embedded device.

In 1104, the GPEEE and the GP may be received from the embedded deviceover the network in response to the URI.

In 1106, the GPEEE may be executed within the web browser to display theGP in the web browser, as indicated in 1108, receive user inputindicating one or more edit operations to be performed on the GP, asindicated in 1110, edit the GP in the web browser in accordance with theone or more edit operations, thereby generating an edited GP, asindicated in 1112, display the edited GP source code in the web browser,as indicated in 1114, and compile or interpret, execute, and/or debug(and possibly optimize) the edited GP, as indicated in 1116.

Moreover, in some embodiments, the method may also include deploying theedited GP to the embedded device, where the updated GP may be executableby the embedded device to perform updated one or more functions, asindicated in 1118. Additionally, similar to the above methods, and asindicated above, in some embodiments, the embedded device may include aninterpreter, and so the GP (or edited GP) may be interpretable by theinterpreter on the embedded device.

Note that the client computer user may continue debugging the edited GPeven after transmitting the GP to the server. For example, the methodmay include debugging the edited GP from the web browser by monitoringits execution on the embedded device.

Summarizing the above, in one embodiment, a browser accessing the URI onthe embedded device may cause the embedded device to provide thegraphical program to the user's browser, as well as the graphicalprogram editor/execution system. The user can then view, edit, and/ordebug the diagram, and then test the modified diagram by running it. Theuser may then store the modified graphical program on the embeddeddevice for subsequent or future use. Thus, the functionality of theembedded device may be updated via a web browser running on a clientcomputer coupled to the embedded device via a network, such as theInternet.

Further Embodiments

Similar to the above methods, in some embodiments, the GPEEE may beconfigured to execute in a sandbox, where executing the GPEEE in the webbrowser comprises executing the GPEEE in the sandbox. Moreover, in someembodiments, the sandbox may be implemented by or as a plugin, whereexecuting the GPEEE in the sandbox comprises executing the GPEEE in theplugin.

In one embodiment, executing the GPEEE in the web browser includesdisplaying a graphical user interface (GUI) of the GPEEE in the webbrowser on a display, where the GUI is configured to display the GP inthe web browser, and receive user input to edit, compile or interpret,execute, optimize or debug the GP in the web browser.

In some embodiments, the GP may be embedded in a web page, where the URIreferences the web page, thereby indicating the GP, and where receivingthe GPEEE from the embedded device over the network in response to theURI comprises receiving the web page from the embedded device over thenetwork, including the GP and the GPEEE. Similarly, executing the editedGP in a web browser via the GPDE comprises displaying the web page on adisplay, and displaying results of executing the GP in the web page onthe display.

FIG. 11B—Flowchart of a Method for Updating an Embedded Device over aNetwork Via a Web Browser—Embedded Device Side

FIG. 11B is a flowchart diagram illustrating one embodiment of a methodfor updating an embedded device over a network via a web browser, fromthe perspective of an embedded device with web server functionality. Themethod shown in FIG. 11B may be used in conjunction with any of thecomputer systems or devices shown in the above Figures, among otherdevices. In various embodiments, some of the method elements shown maybe performed concurrently, in a different order than shown, or may beomitted. Additional method elements may also be performed as desired. Asshown, this method may operate as follows.

In 1122, a network connection may be established with a client computerover a network via a universal resource identifier (URI) associated withthe embedded device, e.g., a user of the client computer may open a webbrowser and direct the browser to the embedded device. Thus, a networkconnection may be established between a client computer and the embeddeddevice.

As described above, the embedded device may be or include a web server,e.g., may be configured to store and serve web pages and/or other webcontent over a network, and may store a graphical program (GP), e.g., anembedded device application, that the embedded device executes toperform one or more functions, as well as a graphical programeditor/execution engine (GPEEE). In other words, the GP may require theGPEEE to execute, and may also be edited in the GPEEE. In variousembodiments, the embedded device may be configured to execute the GP toperform a measurement task, a control task, a simulation task, or anautomation task, among others.

As further noted above, the embedded device may not include a display,i.e., may be “headless”. As also noted above, the GP may include aplurality of interconnected nodes that visually indicate functionalityof the program, and in some embodiments, may be or include a graphicaldata flow program (GDFP), in which case, the GPEEE may be a GDFPEEE, ora graphical data flow program development environment (GDFPDE).

As mentioned above, in one embodiment, the URI specifies the GP, therebyalso indicating the associated GPEEE engine, while in anotherembodiment, the URI specifies the GPEEE, and the associated GP isautomatically indicated as a result. In yet another embodiment, the URImay simply specify the embedded device, and the GPEEE and associated GPare automatically indicated via their association with the embeddeddevice.

In 1124, the GPEEE may be sent to the client computer over the networkin response to the URI. As described above, the GPEEE may be executablein a web browser of the client computer to update (e.g., display,compile, edit, and debug, and/or possibly optimize) the GP and deploythe updated GP to the embedded device, as described above with referenceto FIG. 11A. The method may then include receiving the edited GP fromthe client computer, as indicated in 1126, and executing (possibly viaan interpreter, e.g., the GPEEE) the edited GP to perform updated one ormore functions, as indicated in 1128. Moreover, as discussed above, insome embodiments, the method may include communicating with the GPEEEexecuting on the client computer to enable debugging of the edited GPduring execution of the edited GP on the embedded device.

Thus, the functionality of the embedded device may be updated via a webbrowser running on a client computer coupled to the embedded device viaa network.

Further details regarding the nature and operation of the embeddeddevice, the GP, and the GPEEE, are discussed above with respect to themethod of FIG. 11A, and for brevity, are not repeated here.

FIG. 12—Flowchart of a Method for Implementing a Graphical Data Flow WebApplication Repository

FIG. 12 is a flowchart diagram illustrating one embodiment of a methodfor implementing a graphical data flow web application repository withversion control. The method shown in FIG. 12 may be used in conjunctionwith any of the computer systems or devices shown in the above Figures,among other devices. In various embodiments, some of the method elementsshown may be performed concurrently, in a different order than shown, ormay be omitted. Additional method elements may also be performed asdesired. As shown, this method may operate as follows.

In 522, a network connection may be established with a client computerover a network. More specifically, the network connection may beestablished between the client computer and a device, e.g., a servercomputer such as computer 90, where the server computer stores aplurality of graphical data flow programs (GDFPs), where each GDFPcomprises a respective plurality of interconnected nodes or icons whichvisually indicate the functionality of the program, as well as agraphical data flow program execution engine (GDFP execution engine)required by the GDFPs to execute. The server computer may also storeversion histories of the GDFPs and corresponding versions of the GDFPs.Note that the plurality of GPs may include one or more of a measurementprogram, a control program, a simulation program, or an automationprogram, among others. However, it should be noted that in otherembodiments, any type of graphical data flow programs may be stored asdesired.

In 1204, a universal resource identifier (URI) may be received from theclient computer over the network, where the URI indicates a GDFP of theplurality of GDFPs, and where in some embodiments, method elements 522and 1204 may be performed together, e.g., the user of the clientcomputer may click on a link or may otherwise indicate the URI, whichmay automatically invoke the connection with the server computer (ornot).

In 1206, the GDFP and the GDFP execution engine may be sent to theclient computer over the network in response to the URI, where the GDFPexecution engine may be executable in a web browser on the client systemto execute the GDFP in the web browser, and display an indication ofexecuting the GDFP in the web browser. Similar to the above methods, insome embodiments, the GDFP execution engine may be configured to executein a sandbox, where executing the GDFP execution engine in the webbrowser comprises executing the GDFP execution engine in the sandbox.Moreover, in some embodiments, the sandbox may be implemented by or as aplugin, where executing the GDFP execution engine in the sandboxcomprises executing the GDFP execution engine in the plugin.

Further Embodiments

Displaying an indication of executing the GDFP in the web browser mayinclude displaying a graphical user interface (GUI) of the GDFP in theweb browser on a display, where the GUI is configured to display resultsof the GDFP execution, or receive user input specifying input to theGDFP.

In one embodiment, the GDFP execution engine may executable in a webbrowser on the client system to execute the GDFP in the web browser inresponse to user input received to the web browser invoking execution ofthe GDFP. Alternatively, the GDFP execution engine may execute the GDFPin the web browser automatically, e.g., upon transmittal of the GDFPexecution engine and the GDFP.

As with some of the above methods, in some embodiments, the GDFPexecution engine executing the GDFP in a web browser may include theGDFP execution engine accessing one or more web services over thenetwork, or invoking execution of one or more programs or subprograms onother devices over the network.

In some embodiments, the GDFP execution engine may include an editorthat executes in the web browser on the client computer to receive userinput indicating one or more edit operations to be performed on theGDFP, edit the GDFP in the web browser in accordance with the one ormore edit operations, thereby generating an edited GDFP, and display theedited GDFP in the web browser. Additionally, the method may includereceiving the edited GDFP from the client computer and storing theedited GDFP, where the edited GDFP is available for download by otherusers. The method may further include updating the version history ofthe GDFP. Thus, in some embodiments, a (subsequent) user may access theserver computer and download a specific version of a GP on the server,e.g., based on the version history.

Moreover, the editor may be executable in the web browser to receiveuser input specifying creation of a new GDFP, create the new GDFP inresponse to the user input, and display the new GDFP in the web browser,in which case, the method may also include receiving the new GDFP fromthe client computer and storing the new GDFP, e.g., for download byother users. The method may also include creating and storing a versionhistory of the new GDFP. Thus, new programs may be added to therepository.

In some embodiments, the GDFP execution engine may include a compilerthat is executable in the web browser to compile the edited GDFP,thereby generating an executable of the edited GDFP. The GDFP executionengine may then be executable in the web browser to execute theexecutable of the edited GDFP in the web browser. Alternatively, in someembodiments, the development environment or GDFP execution engine may beor include an interpreter, and executing the GDFP in the web browser mayinclude the GDFP execution engine interpreting the GDFP.

More generally, in some embodiments, the GDFP execution engine may becomprised in an interactive development environment (IDE) executable inthe web browser to edit, analyze, compile, or interpret, the GDFP in theweb browser.

In one embodiment, the GDFP execution engine and the GDFP may be savableon the client computer, where the saved GDFP execution engine isexecutable on the client computer to execute the saved GDFP without theweb browser. In other words, the GDFP execution engine may not require aweb browser or web browser plugin to execute the GDFP.

In another embodiment, the editor may be further executable in the webbrowser on the client computer to auto-save the GDFP during editing ofthe GDFP in the web browser, and store auto-save information on theclient computer or send the auto-save information over the network.Thus, in this embodiment, the method may also include receiving theauto-save information for the GDFP from the client computer over thenetwork, and storing the auto-save information for the GDFP, where theauto-save information is useable to restore previous versions of theGDFP on the client computer.

Similarly, in one embodiment, the editor may be executable in the webbrowser on the client computer to save the GDFP during editing of theGDFP in the web browser in response to user input, and to store saveinformation on the client computer or send the save information over thenetwork. Thus, in this embodiment, the method may also include receivingthe save information for the GDFP from the client computer over thenetwork, and storing the save information for the GDFP, where the saveinformation is useable to restore previous versions of the GDFP on theclient computer.

In one embodiment, sending the GDFP to the client computer may includesending graphical source code of the GDFP and an executable of the GDFP,and executing the GDFP in a web browser may include the GDFP executionengine executing the executable of the GDFP, where the graphical sourcecode of the GDFP is displayable in the web browser on a display. Forexample, the GDFP execution engine may execute the executable whiledisplaying the graphical source code of the GDFP. Alternatively, inembodiments where the GDFP execution engine is or includes aninterpreter, the GDFP execution engine may interpret the graphicalsource code, thus executing the program without requiring a separatelygenerated executable.

In some embodiments, the GDFP is embedded in a web page, where the URIreferences the web page, thereby indicating the GDFP, and where sendingthe GDFP execution engine to the client computer over the network inresponse to the URI includes sending the web page to the client computerover the network, including the GDFP and the GDFP execution engine.Moreover, the GDFP execution engine executing the GDFP in a web browsermay include displaying results of executing the GDFP in the web page onthe display.

In further embodiments, the GDFP execution engine may include or be aGDFP player, wherein executing the GDFP in a web browser via the GDFPexecution engine includes the executing the GDFP in a web browser viathe GDFP player.

In some embodiments, further programs may be retrieved from therepository. More specifically, the method may include receiving anotheruniversal resource identifier (URI) from the client computer over thenetwork, where the URI indicates another GDFP of the plurality of GDFPs,and sending the GDFP to the client computer over the network in responseto the URI, wherein the GDFP execution engine is executable in the webbrowser on the client system to execute the other GDFP in the webbrowser, and display an indication of executing the other GDFP in theweb browser.

Thus, summarizing one embodiment of the above, a server may store aplurality of graphical data flow programs (GDFPs), with a GDFP executionengine (possibly including a development/analysis engine). Users mayaccess the site via web browsers (and URIs), downloading the programsand execution engine as web applications for execution in the browsers.The users may edit (or even create new) programs, and upload the newversions to the server. The server may manage the graphical data flowprograms, possibly maintaining version histories (and the differentversions) of the programs. The server may also store any annotations,auxiliary programs, libraries, and/or engines, appropriate for eachversion. Compatibility of projects, programs, program components, andother resources may be tracked and managed. The server may provideauto-save functionality, whereby saves may be performed on the clientduring editing, e.g., in case of system malfunction, etc., as well assending auto-saves to the server, e.g., after each edit operation.Version control functions may track auto-saves (or manual saves) foreach client/user, although auto-save versions of the program may not beavailable to other clients. Note that embodiments of the aboverepository may facilitate cross-project sharing and references, amongother community aspects. Moreover, in some embodiments, multiple usersmay edit a graphical data flow program at the same time, wheremanagement of such a shared development process may utilize graphicaldifferencing and merging.

Note that in some embodiments, the method may be implemented withrespect to the client side, e.g., from the perspective of clientcomputer functionality, as indicated above in the server side methoddescribed, where, for example, the universal resource identifier (URI)is sent to the client computer over the network, the GDFP, the GDFPexecution engine, and the portion of the data set are received (by theclient computer) over the network in response to the URI, the GDFP isexecuted in a web browser via the GDFP execution engine to analyze theportion of the data set, thereby generating analysis results for theportion of the data set, and the analysis results for the portion of thedata set send (to the server computer) over the network to a repository.Further details for the client side method are described above withrespect to the server side method of FIG. 12.

FIG. 13—Flowchart of a Method for Collecting and Analyzing GraphicalData Flow Web Application Results from Multiple Users

FIG. 13 is a flowchart diagram illustrating one embodiment of a methodfor collecting and analyzing graphical data flow web application resultsfrom multiple users. The method shown in FIG. 13 may be used inconjunction with any of the computer systems or devices shown in theabove Figures, among other devices. In various embodiments, some of themethod elements shown may be performed concurrently, in a differentorder than shown, or may be omitted. Additional method elements may alsobe performed as desired. As shown, this method may operate as follows.

In 1302, a network connection may be established with each of aplurality of client computers over a network. More specifically, thenetwork connection may be established between each client computer and adevice, e.g., a server computer such as computer 90, where the servercomputer stores a plurality of graphical data flow programs (GDFPs),where each GDFP comprises a respective plurality of interconnected nodesor icons which visually indicate the functionality of the program, aswell as a graphical data flow program execution engine (GDFP executionengine) required by the GDFPs to execute.

In various embodiments, the plurality of GPs may include one or more ofa measurement program, a control program, a simulation program, or anautomation program, although any other type of graphical program may beincluded as desired.

In 1304, a universal resource identifier (URI) may be received from eachof the client computers over the network, where the URI indicates a GDFPof the plurality of GDFPs, where method elements 1302 and 1304 may beperformed together, e.g., the users of the client computers may click ona link or may otherwise indicate the URI, which may automatically invokeconnecting with the server computer (or not).

In 1306, the GDFP and the GDFP execution engine may be sent to eachclient computer over the network in response to the URI. As describedabove, the GDFP execution engine may be configured to execute in asandbox, e.g., a secure execution environment, possibly implemented by aplugin. The GDFP execution engine may be executable in a web browser oneach client computer to execute the GDFP in the web browser, therebygenerating execution results, and to send the execution results for theGDFP over the network to the server computer. As noted above, in someembodiments, the GDFP execution engine may be or include an interpreter,and executing the GDFP in the web browser via the GDFP execution enginemay include the GDFP execution engine interpreting the GDFP in the webbrowser.

In 1308, the execution results for the GDFP may be received from eachclient computer over the network.

In 1310, the received execution results may be analyzed, therebygenerating analysis results. In other words, the server computer mayexecute analysis software to analyze the execution results for the GDFPfrom the plurality of client computers. Further details regardingembodiments of the analysis are provided below.

In 1312, the analysis results may be stored, e.g., in a memory medium ofthe server computer, or some other computer, e.g., a data repository.

Further Embodiments

In some embodiments, the analysis results may be sent to each clientcomputer over the network for display in the client computers' browsers.Accordingly, in some embodiments, the GDFP execution engine may befurther executable in the web browser of each client computer to receivethe analysis results over the network, and display the analysis resultsin the web browser.

In one embodiment, the analysis results may include one or morerecommendations regarding the GDFP. In other words, based on theanalysis of the execution results, the program instructions may generaterecommendations regarding improvement of the GDFP and/or its execution.For example, analyzing the received execution results may includeanalyzing information regarding one or more of: performance of theexecuting GDFP, usability of the executing GDFP, execution speed of theGDFP, or compatibility of the GDFP, among others.

Similar to some of the methods described above, executing the GDFP in aweb browser may include the GDFP execution engine accessing one or moreweb services over the network, or invoking execution of one or moreprograms or subprograms on other devices over the network.

The GDFP execution engine may be or include a GDFP player, discussedabove, where executing the GDFP in a web browser via the GDFP executionengine includes the GDFP execution engine executing the GDFP in a webbrowser via the GDFP player.

The GDFP execution engine may be executable in the web browser todisplay a graphical user interface (GUI) in the web browser on adisplay, where the GUI is configured to display results of the GDFPexecution, or receive user input specifying input to the GDFP. In oneembodiment, the GDFP may be embedded in a web page, where the URIreferences the web page, thereby indicating the GDFP, and where sendingthe GDFP execution engine to the client computer over the network inresponse to the URI includes sending the web page to the client computerover the network, including the GDFP and the GDFP execution engine.Accordingly, executing the GDFP in a web browser may include the GDFPexecution engine executing the GDFP in the web page, in which case, GDFPexecution engine may also display results of executing the GDFP in theweb page on the display.

The above embodiments are described with respect to a single GDFP;however, the method is generally applicable to multiple client computersexecuting different GDFPs, as well. For example, in some embodiments,the method may further include establishing a network connection with aplurality of other client computers over a network, and receivinguniversal resource identifier (URIs) from each of the plurality of otherclient computers over the network, where the URIs indicate respectiveGDFPs of the plurality of GDFPs. Note that the multiple URIs may specifydifferent GDFPs, the same GDFPs, or any combination of the two. In otherwords, various of the client computers may specify different GDFPs viarespective URIs.

The respective GDFPs and the GDFP execution engine may then be sent toeach of the plurality of other client computers over the network inresponse to the URIs. The GDFP execution engine may be executable in aweb browser on each client computer to execute the respective GDFP inthe web browser, and display an indication of executing the respectiveGDFP in the web browser, as described above with respect to the singleclient computer. Similarly, the method may also include receiving andstoring execution results from each of the plurality of other clientcomputers over the network. The received execution results may beanalyzed, thereby generating collective analysis results, and thecollective analysis results stored.

The method may further include sending the collective analysis resultsto each client computer over the network for display in the clientcomputers' browsers, where the GDFP execution engine may be furtherexecutable in the web browser of each client computer to receive thecollective analysis results over the network, and display the collectiveanalysis results in the web browser. Similar to above, the collectiveanalysis results may include one or more recommendations regarding theGDFPs downloaded and executed on the client computers. For example, invarious embodiments, the recommendations send to a client computer maybe specific to the particular GDFP executed by that client computer, ormay be applicable to all or some subset of the GDFPs stored on theserver computer, e.g., including that particular GDFP. Thus, the methodmay analyze execution results from many client computers executing manydifferent GDFPs, and/or from many client computers executing the sameGDFP, and may determine recommendations accordingly. In someembodiments, each client computer may send information (e.g., with theexecution results, with the URI, or as a separate communication) relatedto or describing the client computer and/or devices coupled to theclient computer. Thus, the method may include receiving and storingsystem information from each of the plurality of client computers overthe network, where the system information includes information regardingthe client computer, or information regarding devices coupled to theclient computer. Analyzing the received execution results may includeanalyzing the system information from each of the plurality of clientcomputers, and so recommendations may be determined based at leastpartially on client computer attributes.

For example, in one exemplary embodiment directed to a measurementapplication, the analysis may determine that a particular dataacquisition (DAQ) card works better than other models of card for theapplication and hardware of the client computer (measurement system),and so may recommend that DAQ card. As another example, the systeminformation received from a client computer may indicate parallelprocessing capabilities, e.g., multiple processors or processing cores,and so the method may include generating a recommendation that the userof the client computer parallelize the GDFP, enable automaticparallelism, or even download another version of the program designedfor parallel execution. Other exemplary analyses may relate to softwareand/or hardware compatibilities, program efficiencies (orinefficiencies), debugging, and so forth, as desired.

Thus, summarizing the above at a high level, in some embodiments,multiple users may download a graphical data flow program and agraphical data flow program execution system from a server and executethem in their browsers. Each browser may send results (and possiblyinput/context data) to the server. The server may analyze the resultsand provide the results (with possible recommendations) for display inthe users' browsers.

Note that in some embodiments, the method may be implemented withrespect to the client side, e.g., from the perspective of clientcomputer functionality. In other words, the server side method describedabove clearly implies a corresponding client side method, e.g., forevery server side sending operation there is necessarily a client sidereceiving operation, and vice versa, and so forth.

FIG. 14—Flowchart of a Method for Licensing and Managing SharedGraphical Data Flow Web Applications

FIG. 14 is a flowchart diagram illustrating one embodiment of a methodfor licensing and managing shared graphical data flow web applications,from the perspective of a server computer. The method shown in FIG. 14may be used in conjunction with any of the computer systems or devicesshown in the above Figures, among other devices. In various embodiments,some of the method elements shown may be performed concurrently, in adifferent order than shown, or may be omitted. Additional methodelements may also be performed as desired. As shown, this method mayoperate as follows.

In 522, a network connection may be established with a client computerover a network. More specifically, the network connection may beestablished between the client computer and a device, e.g., a servercomputer such as computer 90, where the server computer stores aplurality of graphical data flow programs (GDFPs), where each GDFPcomprises a respective plurality of interconnected nodes or icons whichvisually indicate the functionality of the program, as well as agraphical data flow program execution engine (GDFP execution engine)required by the GDFPs to execute. The server computer may also storespecification of intellectual property rights and licensing for each ofthe GDFPs.

As with the method of FIG. 13, in various embodiments, the plurality ofGPs may include one or more of a measurement program, a control program,a simulation program, or an automation program, although any other typeof graphical program may be included as desired.

In 1404, a universal resource identifier (URI) may be received from theclient computer over the network, where the URI indicates a graphicaldata flow program (GDFP) or a GDFP execution engine for executing theGDFP, where method elements 522 and 1404 may be performed together,e.g., the user of the client computer may click on a link or mayotherwise indicate the URI, which may automatically invoke theconnection with the server computer (or not).

In 1406, the specification of intellectual property rights and licensingfor the GDFP may be analyzed. For example, the specification ofintellectual property rights and licensing for the GDFP may be analyzedwith respect to constraints regarding terms of use of the GDFP, e.g.,who may download the program, whether the program may be edited, whetheror how the program may be used for commercial purposes, and so forth.

In 1408, a determination may be made based on the analysis of 1406 as towhether the specification of intellectual property rights and licensingfor the GDFP permits sending the GDFP to the client computer. If thespecification of intellectual property rights and licensing for the GDFPpermits, the GDFP may be sent to the client computer over the network inresponse to the URI (and in accordance with the specification ofintellectual property rights and licensing for the GDFP), as indicatedin 1412, where the GDFP execution engine may be executable in a webbrowser on the client system to execute the GDFP in the web browser, anddisplay an indication of executing the GDFP in the web browser. Forexample, the GDFP execution engine may be executable in the web browserto display a GUI in the web browser on a display, where the GUI isconfigured to display results of the GDFP execution, or receive userinput specifying input to the GDFP.

If, on the other hand, the specification of intellectual property rightsand licensing for the GDFP does not permit (the sending of the GDFP andthe GDFP execution engine), an indication to that effect may be sent tothe client computer over the network, as indicated in 1410. In otherwords, the method may indicate to the client computer that thespecification of intellectual property rights and licensing for the GDFPdoes not permit sending the GDFP and the GDFP execution engine to theclient computer, e.g., by sending a message for display on the clientcomputer.

Further Embodiments

In some embodiments, the method may include sending informationregarding the specification of intellectual property rights andlicensing for the GDFP to the client computer over the network. The GDFPexecution engine may be executable in the web browser to receive theinformation regarding the specification of intellectual property rightsand licensing for the GDFP over the network, and to display a graphicaluser interface (GUI) in the web browser on a display, where the GUI maybe configured to display the information regarding the specification ofintellectual property rights and licensing for the GDFP, e.g., to theuser of the client computer.

Moreover, the GDFP execution engine may also be configured to send userinformation (to the server computer) confirming that the user owns therights to the GDFP, e.g., a user ID that may be compared to ownershipinformation for the GDFP stored on the server computer. Accordingly, theGDFP execution engine may be configured to receive user input modifyingthe specification of intellectual property rights and licensing for theGDFP, and send an indication of the user input modifying thespecification of intellectual property rights and licensing for the GDFPover the network.

The method may accordingly include receiving the user informationconfirming that the user owns the rights to the GDFP, and receiving theindication of the user input modifying the specification of intellectualproperty rights and licensing for the GDFP from the client computer overthe network, in response to which the method may modify thespecification of intellectual property rights and licensing for the GDFPin accordance with the received indication. Thus, in some embodiments,the owner of the rights to the GDFP may modify the specification ofintellectual property rights and licensing for the GDFP.

More generally, in some embodiments, client user information may beprovided to the server computer, e.g., via a login process, e.g., wherea user ID sent by the client computer may be compared to informationstored on the server computer, e.g., a user's account information, andused to determine the user's rights with respect to the GDFP inaccordance with the specification of intellectual property rights andlicensing for the GDFP.

In some embodiments, the GDFP execution engine sent to the clientcomputer may include an editor that executes in the web browser on theclient computer to receive user input indicating one or more editoperations to be performed on the GDFP, edit the GDFP in the web browserin accordance with the one or more edit operations, thereby generatingan edited GDFP, and display the edited GDFP in the web browser. In otherembodiments, subject to the specification of intellectual propertyrights and licensing for the GDFP, the GDFP execution engine sent to theclient computer may include additional functionalities, e.g., staticanalysis, dynamic analysis, compilation or interpretation, deployment,and so forth, as desired.

As with the above-described methods, the GDFP execution engine may beconfigured to execute in a sandbox, e.g., a secure executionenvironment, possibly implemented as or by a plugin. The GDFP executionengine may be executable in a web browser on the client system toexecute the GDFP in the web browser, and display an indication ofexecuting the GDFP in the web browser. Alternatively, the GDFP executionengine may be or include a GDFP player, and executing the GDFP in a webbrowser via the GDFP execution engine may include the GDFP executionengine executing the GDFP in a web browser via the GDFP player.

Moreover, in some embodiments, the GDFP execution engine is or includesan interpreter, and executing the GDFP in the web browser may includethe GDFP execution engine interpreting the GDFP. Thus, rather thancompiling the graphical source code of the GDFP to generate anexecutable, the GDFP execution engine may interpret the (graphicalsource code of the) GDFP at runtime

As also discussed above, in executing the GDFP, the GDFP executionengine may be executable to access one or more web services over thenetwork, or invoke execution of one or more programs or subprograms onother devices over the network.

In one embodiment, the GDFP may be embedded in a web page, where the URIreferences the web page, thereby indicating the GDFP. Sending the GDFPexecution engine to the client computer over the network in response tothe URI may thus include sending the web page to the client computerover the network, including the GDFP and the GDFP execution engine.Accordingly, the GDFP execution engine may be executable in the webbrowser to execute the GDFP in the web page, and to display results ofexecuting the GDFP in the web page on the display.

Thus, in some embodiments of the above method, a server may store aplurality of graphical data flow programs (GDFP), with a GDFP executionengine (possibly including a development/analysis engine or IDE, asdescribed above). Legally binding intellectual property rights andlicensing may be specified for each GDFP. For example, in variousembodiments, there may be a site-wide rights/license policy (orpolicies), or the rights/license for each GDFP may be specified by theowner, e.g., the provider/developer/creator of the GDFP, e.g., based onor similar to the Creative Commons intellectual property framework.

Thus, embodiments of the above method may be used to implement digitalrights management (DRM) applied to web hosted graphical data flowprogram execution. Note that in some embodiments, the method may beimplemented with respect to the client side, e.g., from the perspectiveof client computer functionality.

FIG. 15A—Flowchart of a Method for Providing Online Graphical Data FlowWeb Application Tools or Services for Charge—Server Side

FIG. 15 is a flowchart diagram illustrating one embodiment of a methodfor providing online graphical data flow programs, e.g., graphical dataflow web application programs, e.g., implementing various software toolsor services, for charge, from the perspective of a server computer,e.g., computer 90, or another computer. The method shown in FIG. 15 maybe used in conjunction with any of the computer systems or devices shownin the above Figures, among other devices. In various embodiments, someof the method elements shown may be performed concurrently, in adifferent order than shown, or may be omitted. Additional methodelements may also be performed as desired. As shown, this method mayoperate as follows.

In 522, a network connection may be established with a client computerover a network, e.g., a network connection may be established betweenthe client computer and a server computer. The server computer may storea plurality of graphical data flow programs, e.g., web applications, andpossibly software tools, and so forth, where each GDFP is accessible anduseable via web browsers executing on client computers. The servercomputer may also store a GDFP execution engine, where the GDFPs requirethe GDFP execution engine to execute. Note that in other embodimentsonly one GDFP may be stored on the server computer.

The GDFPs may be of any type or functionality desired. For example, invarious embodiments, the GDFPs may include or be task or domain specificprograms or applications for industrial, scientific, or evenentertainment purposes, e.g., data analysis and processing, measurement,testing, control, or automation, among others. For example, the GDFP maybe or include a measurement application, where the measurementapplication is executable in the web browser on the client computer toperform a specified measurement function. In another embodiment, theGDFP may be a model of a hardware device, e.g., useable to observe ortest the functionality of the device without the device itself, where,for example, the model may “stand in” for the device during operation ofa system, e.g., a measurement system, e.g., to determine theappropriateness (or not) of the device for the system. In someembodiments, the model may be of a hardware system, e.g., that includesmultiple devices.

In 1504, a universal resource identifier (URI) may be received from theclient computer over the network, where the URI indicates a GDFP of theplurality of GDFPs, or, in alternate embodiments, the lone GDFP.

In 1506, the GDFP and the GDFP execution engine may be sent to theclient computer over the network in response to the URI. The GDFPexecution engine may be executable in a web browser to execute the GDFPto perform the specified functionality of the GDFP.

In 1508, a charge for use of the GDFP on the client computer may beassessed. Note that charging for use of the GDFP may be accomplished inany way desired, e.g., charging a client account, charging/billing for asubscription service, charging/billing per use, e.g., “a la carte”, andso forth.

Further Embodiments

In one embodiment, assessing a charge for use of the GDFP on the clientcomputer may include assessing the charge in accordance with a specifieduse plan. For example, in one embodiment, the specified use plan mayinclude a subscription to one or more levels of service, where eachlevel of service specifies GDFPs available to users at that level ofservice, or conditions of use of GDFPs available to users at that levelof service. In another embodiment, the specified use plan may be orinclude a pay per use plan. For example, the pay per use plan mayspecify time-metered use of the GDFP or use-metered use of the GDFP. Inother words, the user may be charged for the amount of time the GDFP isused, or for the amount of use of the GDFP, either of which may betracked or determined by the GDFP itself, or by software associated withthe GDFP, e.g., that may be downloaded with the GDFP for execution onthe client computer, or that may execute on the server and monitor theGDFP use, e.g., by receiving use information from the GDFP over thenetwork.

The GDFP and the GDFP execution engine may be automatically deleted fromthe client computer after use in accordance with the specified use plan.Thus, for example, if the specified use plan specifies a singleexecution of the GDFP, after the GDFP executes on the client computer,the GDFP and the GDFP execution engine may be automatically deleted.Similarly, if the specified use plan specifies use of the GDFP for aspecified time period, e.g., one week, then after the specified timeperiod, e.g., from the time of download or from the time of firstexecution on the client computer, the GDFP and the GDFP execution enginemay be automatically deleted. Alternatively, the GDFP and the GDFPexecution engine may simply be disabled and left resident on thecomputer for some specified duration.

In some embodiments, the method may also include receiving an indicationof the specified use plan from the client computer over the network, andstoring information specifying the specified use plan for a user of theclient computer, e.g., for determining user (or client) privileges withrespect to the GDFPs (or related software). For example, the GDFPexecution engine (or associated software) may execute on the clientcomputer to present use plan options, e.g., via a GUI, and the user mayprovide input to the GUI specifying the desired use plan. An indicationof the specified use plan may then be sent to the server computer.

In some embodiments, the method may include sending an indication of theassessed charge to a user of the GDFP, or a representative of the user.For example, an account associated with the user may be billed inaccordance with the assessed charge, or a bill for the assessed chargemay be sent to the user of the GDFP, or a representative, i.e.,associate, of the user.

Accordingly, the method may further include receiving payment for theassessed charge. For example, receiving payment for the assessed chargemay include receiving credit card information from the client computerover the network, and billing the assessed charge to the credit card.Note that any other billing/payment techniques may be used as desired,including using third party billing or collecting services.

In some embodiments, in addition to sending the GDFP execution engine,the method may include sending one or more additional programs to theclient computer, in accordance with the specified use plan. For example,the specified use plan may specify and permit downloading and using oneor more software tools for use with the GDFP, e.g., to create, edit,compile or interpret, execute, analyze, optimize, or debug GDFP programsin the web browser, or to otherwise provide, e.g., implement orfacilitate, a web application software service, e.g., related to suchprograms, among other functionalities. Thus, for example, in someembodiments, the one or more software tools may be or include a GDFPeditor, a GDFP static analyzer, a GDFP dynamic analyzer, a GDFP compileror interpreter, or a GDFP interactive development environment (IDE),among others. In various embodiments, the one or more software tools mayprovide any functionality desired.

Thus, the method may include sending at least one software tool of theone or more software tools to the client computer over the network,where the at least one software tool is executable in the web browser onthe client computer to perform one or more functions with respect to theGDFP. For example, in an embodiment where the software tool is a GDFPIDE, the user may execute the IDE in the web browser to edit, analyze,execute, debug, or otherwise modify or develop the GDFP. Note that inthis embodiment, the GDFP execution engine may be included in the GDFPIDE.

The at least one software tool may be deleted from the client computerwhen the GDFP and the GDFP execution engine are deleted.

In embodiments where the GDFP is a model of a hardware device, mentionedabove, the method may further include the GDFP execution engine (orassociated software, e.g., a software tool) executing in the web browserto present an offer to sell the device, receive user input specifyingpurchase of the device, and send an indication of the purchase of thedevice over the network. In other words, once the user has tested thedevice via executing the model of the device, the user may be given theoption to purchase the device. Thus, the method may also includereceiving the indication of the purchase of the device from the clientcomputer over the network. Assessing the charge for use of the GDFP onthe client computer may include assessing a charge for the device,although in some embodiments, this purchase/charge may be handled as aseparate transaction from the original use of the GDFP (model).

Once the device has been purchased, the device may be delivered to theuser.

In some embodiments, the GDFP may be configured to execute in a sandbox,where the sandbox provides or implements a secure execution environmentfor the GDFP. The GDFP being executable in the web browser may thusinclude the GDFP being executable in the sandbox. As noted above, thesandbox may be implemented by a plugin, and so the GDFP being executablein the sandbox may include the GDFP being executable in the plugin.

In further embodiments, the GDFP execution engine is or includes aninterpreter, and executing the GDFP in the web browser may include theGDFP execution engine interpreting the GDFP. Thus, rather than compilingthe graphical source code of the GDFP to generate an executable, theGDFP execution engine may interpret the (graphical source code of the)GDFP at runtime

Thus, embodiments of the above method may implement an e-commerce systemfor providing web-based graphical data flow programs for execution.

FIG. 15B—Flowchart of a Method for Providing Online Graphical Data FlowWeb Application Tools or Services for Charge—Client Side

FIG. 15B is a flowchart diagram illustrating one embodiment of a methodfor providing online graphical data flow programs, e.g., graphical dataflow web application programs, e.g., implementing various software toolsor services, for charge, from the perspective of a client computer,e.g., computer 82, or another computer. The method shown in FIG. 15B maybe used in conjunction with any of the computer systems or devices shownin the above Figures, among other devices. Note that for brevity,details disclosed above with respect to the method of FIG. 15A that areapplicable to the method of FIG. 15B may be omitted in the belowdescription. In various embodiments, some of the method elements shownmay be performed concurrently, in a different order than shown, or maybe omitted. Additional method elements may also be performed as desired.As shown, this method may operate as follows.

In 502, a network connection may be established with a server computerover a network, e.g., a user may open a web browser and direct thebrowser to the server computer, where, as indicated above, the servercomputer stores a plurality of graphical data flow programs (or,alternatively, one GDFP), e.g., web applications, and possibly softwaretools, and so forth, where each GDFP is accessible and useable via webbrowsers executing on client computers. The server computer may alsostore a GDFP execution engine, where the GDFPs require the GDFPexecution engine to execute.

Note, however, that in other embodiments, the server computer may storeone GDFP, rather than a plurality.

In 1504, a universal resource identifier (URI) may be sent to the servercomputer over the network, where the URI indicates a GDFP (e.g., of theplurality of GDFPs). Method elements 502 and 1504 may be performedtogether, e.g., the user (e.g., of the client computer) may click on alink or may otherwise indicate the URI, which may automatically invokethe connection with the server computer.

In 1506, the GDFP and the GDFP execution engine may be received from theserver computer over the network in response to the URI.

In 1508, the GDFP may be executed in a web browser via the GDFPexecution engine. In other words, the GDFP execution engine may executethe GDFP within the web browser as a web application. In one embodiment,the method may include receiving user input to the web browser invokingexecution of the GDFP, and the GDFP may be executed in the browser inresponse to the received user input.

As described above, some embodiments, the GDFP execution engine is orincludes an interpreter, and executing the GDFP in the web browser mayinclude the GDFP execution engine interpreting the GDFP. Thus, ratherthan compiling the graphical source code of the GDFP to generate anexecutable, the GDFP execution engine may interpret the (graphicalsource code of the) GDFP at runtime.

In 1510, an indication of an assessed charge for use of the GDFP may bereceived from the server computer over the network. In other words, theclient computer may receive an indication of charges assessed by theserver computer for use of the GDFP, e.g., per a specified use plan.

Further details regarding the nature and operation of the GDFP(s), theGDFP execution engine, software tools, payment methods, etc., areprovided above with respect to FIG. 15A.

FIG. 16A—Flowchart of a Method for Developing a Graphical Data FlowProgram (GDFP) with Multiple Models of Computation in a Browser—ClientSide

FIG. 16A is a flowchart diagram illustrating one embodiment of a methodfor developing a graphical program with multiple computational modelsover a network via a web browser, from the perspective of a clientcomputer, e.g., computer 82, or another computer. The method shown inFIG. 16A may be used in conjunction with any of the computer systems ordevices shown in the above Figures, among other devices. In variousembodiments, some of the method elements shown may be performedconcurrently, in a different order than shown, or may be omitted.Additional method elements may also be performed as desired. As shown,this method may operate as follows.

In 502, a network connection may be established with a server computerover a network, e.g., a user may open a web browser and direct thebrowser to the server computer.

In 1604, a universal resource identifier (URI) may be sent to the servercomputer over the network, where the URI indicates a graphical program(GP) or at least a portion of an integrated development environment(IDE), which may be referred to simply as the IDE for convenience. Theat least a portion of the IDE may be executable to develop, e.g., tocreate, edit, analyze, execute, or debug, graphical programs thatinclude two or more computational models. Similarly, the graphicalprogram (which may or may not already exist) may include two or morecomputational models, e.g., graphical data flow (e.g.,LabVIEW)/procedural, graphical data flow/simulation (e.g., Simulink),graphical data flow/textual (e.g., MathScript), and so forth. In someembodiments, the graphical program is or includes a graphical data flowprogram (GDFP), and the IDE is or includes a graphical data flow programdevelopment environment (GDFPDE). In other words, at least one of themodels of computation may be graphical data flow.

In one embodiment, at least one of the two or more models of computationmay include or be a physical domain, e.g., the physical domain mayinclude one or more of an electrical domain, a chemical domain, amechanical domain, an electromagnetic domain, a hydraulic domain, anacoustic domain, an optical domain, or a thermodynamic domain, amongothers.

In 1606, the IDE may be received from the server computer over thenetwork in response to the URI. The IDE may be executable in a webbrowser to create, edit, compile or interpret, execute, analyze, test,optimize, and/or debug graphical programs in the web browser, via any ofthe techniques described herein (or others), as applied to graphicalprograms that contain multiple computational models (i.e., models ofcomputation). Thus, the (at least a portion of the) IDE may include oneor more of an editor, edit time analyzer, compiler, execution engine(which may include an interpreter), and/or dynamic (run time) analyzer,among others, as desired.

Thus, for example, in one embodiment, the graphical program is apre-existing program, where the IDE is associated with the pre-existingprogram, and where the URI specifies the pre-existing program, therebyalso indicating the associated IDE, where, for example, the graphicalprogram may also be received from the server computer in response to theURI; or alternatively, in embodiments where the graphical program is nota pre-existing program, the URI may specify the IDE, and the IDE may beexecutable in the web browser to receive user input specifying creationof the graphical program, and create (and edit, debug, etc.) thegraphical program in response to the user input.

As with the above methods, the IDE may be configured to execute in asandbox, and so executing the IDE in the web browser may includeexecuting the IDE in the sandbox. In embodiments where the sandbox isimplemented as or by a plugin, the IDE may be executed in the plugin.

Moreover, as also with the above methods, in some embodiments, the GDFPexecution engine is or includes an interpreter, and executing the GDFPin the web browser may include the GDFP execution engine interpretingthe GDFP, and so rather than compiling the graphical source code of theGDFP to generate an executable, the GDFP execution engine may interpretthe (graphical source code of the) GDFP at runtime, i.e., making acompiler unnecessary.

The IDE may be executable in the web browser to perform variousfunctions, e.g., for developing graphical programs with multiplecomputational models. For example, in one embodiment, the IDE isexecutable in the web browser to display the graphical program in theweb browser, receive user input indicating one or more edit operationsto be performed on the graphical program, edit the graphical program inthe web browser in accordance with the one or more edit operations,thereby generating an edited graphical program, display the editedgraphical program (e.g., edited graphical source code) in the webbrowser, and compile or interpret, execute, and/or analyze (and possiblyoptimize) the edited graphical program. In some embodiments, the IDE maybe further executable to automatically parallelize one or more portionsof the graphical program in response to analyzing the program, and/orotherwise optimize the program.

Note that in various embodiments, to debug the graphical program the IDEmay be configured to statically analyze the graphical program at edittime, and/or dynamically analyze the graphical program at run time,i.e., during execution. In other embodiments, the (at least a portion ofthe) IDE may provide any functionality desired. Note that the IDE mayfacilitate development of portions of the graphical program underrespective computational models, and thus, for example, in oneembodiment, the IDE may allow both graphical program editing, as well astextual editing, or graphical data flow development and simulationdevelopment, or graphical data flow development and domain specificapplication development, and so forth. Thus, the editing or developmentcapabilities of the (at least a portion of the) IDE may support programdevelopment under multiple models of computation.

Moreover, in one embodiment, the IDE may executable in the web browserto display the graphical program in the web browser where respectiveportions of the graphical program are in accordance with the two or morecomputational models, and where the IDE displaying the graphical programin the web browser includes visually indicate each respective portion ofthe program in accordance with its model of computation. For example, inan exemplary embodiment where the graphical program includes graphicaldata flow and textual procedural models, the textual procedural programcode may be visually demarcated, e.g., contained or enclosed in arectangular box, from the graphical data flow code. Other exemplaryvisual designations or indications may utilize color,segregation/grouping within a single window or in respective windows,labeling, and so forth, although it should be noted that any techniquesmay be used to display or visually denote the computationalmodel-specific program code, as desired.

FIG. 16B—Flowchart of a Method for Developing a Graphical Program in aWeb-Hosted Program Development Environment—Server Side

FIG. 16B is a flowchart diagram illustrating one embodiment of a methodfor developing a graphical program with multiple computational modelsover a network via a web browser, but from the perspective of a servercomputer, e.g., computer 90, or another computer. The method shown inFIG. 16B may be used in conjunction with any of the computer systems ordevices shown in the above Figures, among other devices. In variousembodiments, some of the method elements shown may be performedconcurrently, in a different order than shown, or may be omitted.Additional method elements may also be performed as desired. As shown,this method may operate as follows.

In 522, a network connection may be established with a client computerover a network.

In 1624, a universal resource identifier (URI) may be received from theclient computer over the network, where the URI indicates a graphicalprogram (GP) or at least a portion of an IDE for developing graphicalprogram, which, as noted above, for brevity may be referred to simply asthe IDE, where method elements 522 and 1624 may (or may not) beperformed together, e.g., the user of the client computer may click on alink or may otherwise indicate the URI, which may automatically invokethe connection with the server computer. As noted above, the GP mayinclude a plurality of interconnected nodes or icons which visuallyindicate the functionality of the program, and also includes multiplecomputational models (i.e., models of computation).

In 1626, the IDE may be sent to the client computer over the network inresponse to the URI. As described above, the IDE may be executable in aweb browser, e.g., in a sandbox, possibly implemented by or via aplugin. Additionally, in some embodiments, the GDFP execution engine isor includes an interpreter, and executing the GDFP in the web browsermay include the GDFP execution engine interpreting the GDFP.

The nature and operation of the IDE executing on the client computer isdescribed above with reference to FIG. 16A, as are various embodimentsof the graphical program, and so for brevity are not re-presented here.

Thus, summarizing one embodiment of the above methods, a user may open abrowser and access a URI at a server, where the URI references anexisting graphical program and/or a graphical program development system(or portion thereof), e.g., a graphical program editor, a graphicalprogram execution system, and/or a graphical program analysis system,among others. The graphical program, whether pre-existing or to bedeveloped, includes two or more computational models. The server mayprovide the graphical program development system (or portion), and ifthe graphical program already exists, may also provide the graphicalprogram. The graphical program development system (or portion) thenexecutes in the user's browser, allowing the user to develop, execute,optimize, and/or analyze (debug), the graphical program in the browser.The graphical program may be saved or deployed locally and/or to aremote device, e.g., the server.

It should be noted that in alternative embodiments, the methods of FIGS.16A and 16B may be implemented where the at least a portion of the IDEis a graphical program editor, a graphical program execution engine,and/or a graphical program analyzer (e.g., static or dynamic). In otherwords, the methods may be similar to the methods of FIGS. 5A/5B, 6A/6B,and/or 7A/7B, (or others of the methods disclosed herein), but where thegraphical programs each include multiple models of computation.

FIG. 17A—Flowchart of a Method for Executing a Physical Model withMultiple Physical Domains in a Browser—Client Side

FIG. 17A is a flowchart diagram illustrating one embodiment of a methodfor executing a physical model with multiple physical domains via a webbrowser, from the perspective of a client computer, e.g., computer 82,or another computer. The method shown in FIG. 17A may be used inconjunction with any of the computer systems or devices shown in theabove Figures, among other devices. In various embodiments, some of themethod elements shown may be performed concurrently, in a differentorder than shown, or may be omitted. Additional method elements may alsobe performed as desired. As shown, this method may operate as follows.

In 502, a network connection may be established with a server computerover a network, e.g., a user may open a web browser and direct thebrowser to the server computer.

In 1704, a universal resource identifier (URI) may be sent to the servercomputer over the network, where the URI indicates a graphical program(GP) or a graphical program execution engine (GPEE). The graphicalprogram may comprise or implement a physical model (PM), and so the GPEEmay be or include a PM execution engine (PMEE). Note that for brevity,the graphical program that implements the physical model may be referredto as the physical model. The GPEE may be executable in a web browser toexecute graphical programs that comprise or implement physical modelsthat include two or more physical domains, e.g., two or more ofelectrical, chemical, mechanical, hydrodynamic, thermodynamic, and soforth. Similarly, the implemented physical model (which may or may notalready exist) may include two or more physical domains. Note that thegraphical program/physical model may be implemented using any of avariety of approaches, e.g., graphical programming, graphical data flow(e.g., LabVIEW), simulation (e.g., Simulink), textual programming, statemachines, etc., as desired. In some embodiments, a model of a physicalphenomenon may be or include a simulation or emulation of thephenomenon, depending on the resolution and/or basis of the model.

In 1706, the GPEE may be received from the server computer over thenetwork in response to the URI. The GPEE may be executable in a webbrowser (e.g., in a sandbox) to execute a graphical program implementingmulti-domain physical models in the web browser, via any of thetechniques described herein (or others), as applied physical models thatcontain multiple physical domains. Thus, in one embodiment, the GPEE mayinclude respective portions or functionalities for executing respectivephysical domain specific portions of the graphical program/physicalmodel.

In various embodiments, the GPEE may include further functionality,e.g., may include (possibly for each physical domain): a graphicalprogram/physical model editor, a graphical program/physical modelcompiler or interpreter, a graphical program/physical model analyzer, agraphical program/physical model optimizer, and so forth, and so may beor include at least a portion of an IDE, e.g., a graphicalprogram/physical model IDE (PMIDE), as desired.

Thus, for example, in one embodiment, the graphical program thatimplements the model is a pre-existing graphical program, where the GPEEis associated with the pre-existing graphical program, and where the URIspecifies the pre-existing graphical program, thereby also indicatingthe associated GPEE, where, for example, the graphical programimplementing the physical model may also be received from the servercomputer in response to the URI; or alternatively, in embodiments wherethe graphical program implementing the physical model is not apre-existing graphical program, the URI may specify the GPEE, and theGPEE (e.g., a PMIDE) may be executable in the web browser to receiveuser input specifying creation of the graphical program, and create (andedit, debug, etc.) the graphical program in response to the user input.

As with the above methods, the GPEE may be configured to execute in asandbox, and so executing the GPEE in the web browser may includeexecuting the GPEE in the sandbox. In embodiments where the sandbox isimplemented as or by a plugin, the GPEE may be executed in the plugin.

Moreover, in one embodiment, the GP execution engine and the GP may besavable on the client computer, where the saved GP execution engine isexecutable on the client computer to execute the saved GFP without theweb browser. In other words, the GP execution engine may not require aweb browser or web browser plugin to execute the GP.

In embodiments where the GPEE is a PMIDE, the PMIDE may be executable inthe web browser to perform various functions for developing graphicalprograms implementing physical models with multiple physical domains.For example, in one embodiment, the PMIDE is executable in the webbrowser to display the graphical program/physical model in the webbrowser, receive user input indicating one or more edit operations to beperformed on the physical model, edit the physical model in the webbrowser in accordance with the one or more edit operations, therebygenerating an edited physical model, display the edited physical model(e.g., edited graphical source code) in the web browser, and compile orinterpret, execute, and analyze (and possibly optimize, e.g.,automatically parallelize) the edited graphical program/physical model.Note that in some embodiments, the PMIDE may be configured to staticallyanalyze the graphical program/physical model at edit time, and/ordynamically analyze the graphical program/physical model at run time,i.e., during execution.

In other embodiments, the (at least a portion of the) PMIDE may provideany functionality desired. Note that the PMIDE may facilitatedevelopment of parts of the graphical program implementing portions ofthe physical model under respective physical domains, where, in someembodiments, the different physical domains may be modeled using variousdifferent models of computation or programming languages or paradigms.Thus, for example, in one embodiment, the PMIDE may allow physical modelediting in the physical domains in accordance with their respectivemodels of computation or programming languages. For example, in variousembodiments, the PMIDE may facilitate editing the graphicalprogram/physical model via textual editing, graphical data flowdevelopment, simulation development, object oriented programming,mathematical/symbolic editing, and so forth, as desired. In someembodiments, the GPEE may be a general IDE capable of the physical modelfunctionality described above, as well as functionality for developinggraphical programs in other domains or application areas. In someembodiments, e.g., where the GP comprises a graphical data flow program(GDFP), the GPEE may be or include at least a portion of a graphicaldata flow program development environment (GDFPDE).

In some embodiments, the GPEE may be operable to display a GUI in theweb browser for receiving user input to and/or for displaying outputfrom the GP implementing the physical model. For example, in someembodiments, the output may include animations illustrating the physicalphenomena being modeled. As a simple example, a model of a pendulum maydrive an animation of the pendulum which may be displayed in the GUI.Similarly, a thermodynamic model or simulation of a chemical heatingtank may illustrate heat flow in the tank, e.g., via color. In anotherexemplary embodiment, a model of an electrical (or electronic) circuitimplemented as a graphical program may illustrate the circuit as part ofthe graphical program itself, e.g., where, for example, the icons ornodes in the graphical program illustrate respective circuit components,and where, for example, an LED (light emitting diode) in the circuit maybe shown to “light up” as appropriate per the circuit (model) operation.In other words, in some embodiments, the program may itself be orinclude an illustration of the physical phenomenon being modeled. In oneparticularly illustrative example, the implemented physical model maymodel or simulate heat flow or accumulation in a circuit, and thus maynot only model the electronic behavior of the circuit, but may includethermodynamic aspects of the circuit, e.g., indicating heat flow oraccumulation in the circuit by color. Thus, for example, if a particularcomponent or region of the circuit indicates excessive heat, thedeveloper may modify the model to add or modify a heat exchanger in thecircuit (model), rearrange the components spatially, etc., to addressthe issues raised.

FIG. 17B—Flowchart of a Method for Executing a Physical Model withMultiple Physical Domains in a Browser—Server Side

FIG. 17B is a flowchart diagram illustrating one embodiment of a methodfor executing a physical model with multiple physical domains via a webbrowser, from the perspective of a server computer, e.g., computer 90,or another computer. The method shown in FIG. 17B may be used inconjunction with any of the computer systems or devices shown in theabove Figures, among other devices. In various embodiments, some of themethod elements shown may be performed concurrently, in a differentorder than shown, or may be omitted. Additional method elements may alsobe performed as desired. As shown, this method may operate as follows.

In 522, a network connection may be established with a client computerover a network.

In 1724, a universal resource identifier (URI) may be received from theclient computer over the network, where the URI indicates a graphicalprogram that implements a physical model (PM) or a GP execution engine(GPEE) that may be or include a physical model execution engine (PMEE).As noted above, the GPEE may be executable in a web browser to executephysical models that include two or more physical domains, e.g., two ormore of electrical, chemical, mechanical, hydrodynamic, thermodynamic,and so forth, and the physical model (which may or may not alreadyexist) may include two or more physical domains.

In 1726, the GPEE may be sent to the client computer over the network inresponse to the URI. As described above, the GPEE may be executable in aweb browser, e.g., in a sandbox. Operation of the GPEE on the clientcomputer is described above with reference to FIG. 17A. As noted above,in various embodiments, any of the features and techniques disclosedherein with respect to one method may be used in any others of themethods as desired. One particular example of such broadly applicablefeatures is the ability to save a downloaded execution engine and aprogram, e.g., a graphical program, locally on the client computer,where the saved execution engine is executable to execute (which mayinclude interpretation of) the saved program without a web browser.

Thus, summarizing one embodiment of the above methods, a user may open abrowser and access a URI at a server, where the URI references anexisting graphical program implementing a physical model and/or adevelopment environment, e.g., a physical model development system, (orportion thereof), e.g., a graphical program/physical model editor, agraphical program/physical model execution system, and/or a graphicalprogram/physical model analysis system, among others. As noted above,the physical model implemented by the graphical program, whetherpre-existing or to be developed, includes two or more physical domains.The server may provide the GPEE, and if the graphical program alreadyexists, may also provide the graphical program implementing the physicalmodel. The GPEE then executes in the user's browser, allowing the userto execute, and possibly, to develop, and/or analyze, the graphicalprogram/physical model in the browser. The graphical program/physicalmodel may be saved or deployed locally and/or to a remote device, e.g.,the server.

As described above, the GPEE (or PMIDE) may be executable in a webbrowser, e.g., in a sandbox, possibly implemented by or via a plugin.The nature and operation of the GPEE is described above with referenceto FIG. 17A, as are various embodiments of the physical model, and sofor brevity are not re-presented here.

FIG. 18A—Flowchart of a Method for Cooperative Execution of GraphicalData Flow Programs in Multiple Web Browsers—Client Side

FIG. 18A is a flowchart diagram illustrating one embodiment of a methodfor cooperative execution of graphical data flow programs in multipleweb browsers, from the perspective of a client computer. The methodshown in FIG. 18A may be used in conjunction with any of the computersystems or devices shown in the above Figures, among other devices. Invarious embodiments, some of the method elements shown may be performedconcurrently, in a different order than shown, or may be omitted.Additional method elements may also be performed as desired. As shown,this method may operate as follows.

In 502, a network connection may be established with a server computer.In one embodiment, the network connection may be established betweeneach of a plurality of client computers and the server computer, such ascomputer 90. The server computer may store a graphical data flow program(GDFP), where the GDFP includes a respective plurality of interconnectednodes or icons which visually indicate the functionality of the program,as well as a graphical data flow program execution engine (GDFPexecution engine) required by the GDFP to execute. Additionally, theserver computer may store a data set for which processing or analysis isdesired. The GDFP may be executable in respective web browsers of theclient computers to analyze or otherwise process respective portions ofthe data set.

In 1804, a universal resource identifier (URI) may be sent to the servercomputer from the client computer, or, in some embodiments, from each ofthe client computers over the network, where the URI indicates the GDFP,the GDFP execution engine, the data set, and/or the server itself.

In 1806, the GDFP and the GDFP execution engine may be received by theclient computer, or in some embodiments, by each client computer, overthe network in response to the URI. The GDFP execution engine may beconfigured to execute in a sandbox, e.g., a secure executionenvironment, possibly implemented by a plugin. Moreover, a respectiveportion of the data set may also be received by the client computer, orin some embodiments, respective portions of the data set may be receivedby each of the plurality of client computers.

In 1808, the GDFP execution engine may be executed in a web browser ofthe client computer to analyze the respective portion of the data set,thereby generating analysis results. In plural client systemembodiments, the GDFP execution engine may be executed in a respectiveweb browser of each of the plurality of client computers to analyze therespective portion of the data set, thereby generating respectiveanalysis results. In some embodiments, the (client) user may aid in theanalysis of the data. For example, the method may include receiving userinput to and display output from the GDFP to allow the user to assist inthe analysis of the portion of the data set.

As with the above methods, in some embodiments, the GDFP executionengine is or includes an interpreter, and executing the GDFP in the webbrowser may include the GDFP execution engine interpreting the GDFP, andso rather than compiling the graphical source code of the GDFP togenerate an executable, the GDFP execution engine may interpret the(graphical source code of the) GDFP at runtime, i.e., making a compilerunnecessary.

Moreover, in one embodiment, the GDFP execution engine and the GDFP maybe savable on the client computer, where the saved GDFP execution engineis executable on the client computer to execute the saved GDFP withoutthe web browser. In other words, the GDFP execution engine may notrequire a web browser or web browser plugin to execute the GDFP.

In 1810, the analysis results for the portion of the data set may besent to a repository, e.g., on a server computer, over the network,which in some embodiments may be included on the server computer. Inplural client system embodiments, the respective analysis results forthe respective portions of the data set may be sent to the repositoryover the network, e.g., for collection, assembly, storage, and possiblyfurther analysis.

In some embodiments, the GDFP execution engine may further execute inthe web browser of each client computer to receive analysis results forthe data set (or portions of the data set) over the network, and displaythe analysis results in the web browser. More generally, in oneembodiment, the method may include displaying a representation of thedata set (or portion of the data set) in the web browser, or displayingthe analysis results for the portion of the data set in the web browser.

In some embodiments, the GDFP may be embedded in a web page, where theURI references the web page, thereby indicating the GDFP, and wherereceiving the GDFP execution engine from the server computer over thenetwork in response to the URI comprises receiving the web page from theserver computer over the network, including the GDFP and the GDFPexecution engine. Similarly, executing the GDFP in a web browser via theGDFP execution engine may include displaying the web page on a display,and displaying the analysis results for the portion of the data set inthe web page on the display.

In one embodiment, the GDFP execution engine includes a GDFP player, andso executing the GDFP in a web browser via the GDFP execution engine mayinclude executing the GDFP in a web browser via the GDFP player, e.g.,an execution engine configured to execute in an unsecure executionenvironment.

In some embodiments, the GDFP execution engine may be executable in aweb browser on the client system to execute the GDFP in the web browseras a screensaver. In other words, the GDFP execution engine may executethe GDFP in the web browser when an “idle” condition of the clientcomputer occurs, and may display graphics that are dynamic enough toavoid static screen burn, or that are pleasing or interesting to theeye. Note that in various embodiments, the GDFP execution engine andGDFP may be downloaded from the server computer each time thescreensaver triggers, or may be downloaded once, and executed each timethe screensaver triggers.

Once the portion of the data set has been analyzed, an indication ofcompletion of the analysis of the portion of the data set may be sent tothe server computer. Another portion of the data set may then bereceived from the server computer over the network, and the GDFP may beexecuted in the web browser via the GDFP execution engine to analyze theother portion of the data set, thereby generating analysis results forthe other portion of the data set, and the analysis results for theother portion of the data set sent over the network to the repository.Moreover, the sending an indication, receiving another portion,executing the GDFP, and sending the analysis results, may be repeatedfor further portions of the data set in an iterative manner. In otherwords, as each client computer finishes analyzing its respective portionof data, it may send an indication to that effect to the servercomputer, which may send further data for analysis in response, wherethis process is repeated one or more times in an iterative manner.

FIG. 18B—Flowchart of a Method for Cooperative Execution of GraphicalData Flow Programs in Multiple Web Browsers—Server Side

FIG. 18B is a flowchart diagram illustrating one embodiment of a methodfor cooperative execution of graphical data flow programs in multipleweb browsers, but from the perspective of a server computer, e.g.,computer 90, or another computer. The method shown in FIG. 18B may beused in conjunction with any of the computer systems or devices shown inthe above Figures, among other devices. In various embodiments, some ofthe method elements shown may be performed concurrently, in a differentorder than shown, or may be omitted. Additional method elements may alsobe performed as desired. As shown, this method may operate as follows.

In 1302, a network connection may be established with each of aplurality of client computers over a network. More specifically, thenetwork connection may be established between each client computer and aserver computer, such as computer 90, where the server computer stores agraphical data flow program (GDFP), where the GDFP comprises arespective plurality of interconnected nodes or icons which visuallyindicate the functionality of the program, as well as a graphical dataflow program execution engine (GDFP execution engine) required by theGDFP to execute. Additionally, the server computer may store a data setfor which processing or analysis is desired. The GDFP may be executablein web browsers of the client computers to analyze or otherwise processrespective portions of the data set.

In 1824, a universal resource identifier (URI) may be received from eachof the client computers over the network, where the URI indicates theGDFP, the GDFP execution engine, the data set, and/or the server itself.

In 1826, the GDFP, the GDFP execution engine, and a respective portionof the data set may be sent to each client computer over the network inresponse to the URI. As described above, the GDFP execution engine maybe configured to execute in a sandbox, e.g., a secure executionenvironment. The GDFP execution engine may be executable in a webbrowser on each client computer (e.g., in the sandbox) to execute theGDFP in the web browser to analyze the respective portion of the dataset, thereby generating analysis results, and to send the analysisresults for the respective portion of the data set over the network to arepository, e.g., the server computer.

In embodiments, e.g., where the repository is the server computer (oranother computer), the method may include the server computer executinganalysis software to organize and/or analyze the analysis results forthe respective portions of the data set analyzed by the plurality ofclient computers, and possibly sending the analysis results and/or thedata set (or portion(s) of the data set) to each client computer overthe network, e.g., for display in the web browser.

Operation of the GDFP execution engine on the client computer(s) isdescribed above with reference to the method of FIG. 17A, which alsoindicates or implies various server operations and functionality. Forexample, as noted above, in some embodiments, the repository may becomprised on the server computer, e.g., in a memory medium of the servercomputer, and so the method may further include receiving and storingthe analysis results from each client computer.

As another example, in some embodiments, the (server-side) method mayfurther include analyzing the received analysis results from each clientcomputer, and possibly sending the received analysis results to eachclient computer.

Moreover, as also mention or indicated above in the client side method,in some embodiments the (server side) method may include receiving anindication of completion of the analysis of the (respective) portion ofthe data set from each client computer, and sending another respectiveportion of the data set to each client computer over the network inresponse to the indication, where the receiving an indication, andsending another respective portion of the data set, may be repeated forfurther respective portions of the data set in an iterative manner.

Thus, summarizing one embodiment of the above methods, multiple usersmay open respective browsers and access a URI at a server, whichprovides a graphical program and graphical data flow program executionsystem to each user's browser, along with a respective portion of a dataset to be analyzed or processed. The execution systems on each usersystem may execute the graphical program to analyze respective portionsof a data set for the graphical program in the browser concurrently.Results of the execution may be provided to a server or repository,and/or to each of the browsers.

FIG. 19—Flowchart of Exemplary User Experience

FIG. 19 is a flowchart of method that represents or illustrates anexemplary user experience with respect to shared or community basedprogram development, according to one embodiment. It should be noted,however, that the method/experience shown is exemplary only, and is notintended to limit the method or user experience to any particularfunction, form, or appearance.

As may be seen, in 1902, a user may navigate to a website via URL, e.g.,where the URL may refer to a specified or special web site or resource,e.g., a server, whereby graphical programs, possibly includingexperimental or untested programs, may be developed, and may log in witha user profile, as indicated in 1904. A determination as to whether anempty program editor or an example program is being accessed may bemade, as shown in 1905.

In 1906, if the example program is indicated, the editor may load withthe example program, otherwise, the editor may load empty, as indicatedin 1908, where “load” refers to being deployed to the client computerfor editing, viewing, or execution in a web browser. In other words, theuser may invoke an editor to create a new program, or to edit anexisting program.

Thus, a user may navigate to a developer and/or user community websiteor resource indicated by or associated with the URL, e.g., the URL mayrefer to a web site or resource where community programs may be storedfor subsequent use, e.g., for replicating, linking, viewing, or editing,by a community of users or developers (e.g., where the level of accessor privileges may be specified for users in the community throughpermissions), and may invoke an editor, which may be loaded with aspecified program, or may load empty, e.g., for development of a newprogram. For example, the user may browse available graphical programson the web site, and indicate one for use. Alternatively, in someembodiments, the URL provided by the user may specify the program (alsothereby specifying the server indirectly), as discussed in various ofthe methods described above.

In 1909, since the editor is empty, a determination may be made as towhether the program to be edited is new or existing, and if existing,may be opened in the editor, as shown in 1910. In other words, if theeditor is invoked empty, then the user may still specify a pre-existinggraphical program to open (1910), or may decide to create a newgraphical program.

In 1914, the user may work on the program (e.g., application), e.g., mayedit the program. Exemplary descriptions of creating and editinggraphical programs are provided below.

In 1915, a determination may be made as to whether to save the editedprogram locally or to the server, and the user may save to localstorage, as indicated in 1916, or to the server location, indicated in1918, accordingly.

In 1919, a determination may be made as to whether to deploy or publishthe edited program, and the user may accordingly deploy to a device,e.g., to a server, a controller, a user computer, a thin client, etc.,as desired, as indicated in 1920, or may publish the program to the web,e.g., as a release program to the community, as indicated in 1922, e.g.,for subsequent downloading by other community members.

Finally, in 1924, the user may log out and/or close the browser.Alternatively, prior to logging our or closing the web browser, themethod may proceed to 1905 and continue as described above, e.g., withrespect to another pre-existing graphical program, or creating a newgraphical program. In other words, the method may iterate, allowing theuser to create and/or edit multiple graphical programs, as desired.

The following describes one exemplary embodiment of the above userexperience where the graphical program is a Web LabVIEW application andthe website is operated and maintained by National InstrumentsCorporation (NI), although it should be noted that the user experiencedescribed is illustrative only, and is not intended to limit theexperience to any particular form or functionality.

In this exemplary embodiment, the user navigates to a Web LabVIEWlanding page via a URL (e.g., hosted on an NI server). The user can noweither open an example program (e.g., created by developers at NI) or aprogram created by a member of the community (possibly by himself) in aWeb LabVIEW IDE, or the user can just launch the Web LabVIEW IDE (e.g.,editor) with no starting program open. With the latter case, the IDEopens up blank, at which point the user can either create a new programor open an existing program from the server or from his local machine.The user then works on the program, and when ready to save the work, theuser can save it either to the ni.com server or to the user's localmachine. Any program created by a user may be deployed (e.g., to ahardware target) from within the IDE (editor). If the user chooses to dothis, a URL may be provided that may be used to access the program thatis now being served up from the hardware target. A user may also chooseto share the program with the community (e.g., of developers or users).Again, the user may choose this option within the editor and will thenbe given a choice on whether other community users can only view therunning application or view the graphical source code as well. The usermay receive an embed tag (should the user choose to embed a LabVIEWplayer to host the running program on a webpage of the user's choice) ora Web LabVIEW community web page that already contains the LabVIEWplayer to host the running program. When the user is done with the WebLabVIEW editor, the user can simply close the browser (or logoff thewebsite).

Other Embodiments

The following describes various exemplary embodiments and variants ofsome of the above-described methods.

Implementing a Dynamically Typed Mathematical Scripting Language in aBrowser

In one embodiment, a dynamically typed mathematical scripting language,e.g., Mathscript™, provided by National Instruments Corporation, orMatLab™, provided by The MathWorks, may be implemented in a web browser,similar to the graphical programming languages and programs discussedabove. For example, in a Mathscript embodiment, a user may open abrowser and access a URI at a server, and the server may provide theMathscript editor and execution engine (and possibly a script, i.e., aMathscript program) to the user's computer system, or more specifically,to a web browser executing on the computer system, and the user mayexecute (and in some embodiments, create, edit, analyze, debug, etc.)the script. In various embodiments, any of the techniques discussedabove with respect to programs, e.g., graphical programs, may beimplemented for such mathematical scripting languages and scripts orprograms.

Static Program Analysis

In one embodiment, a server computer (or collection of server computers)may receive graphical programs, e.g., graphical program source code,from a plurality of developers, e.g., via any of the applicabletechniques discussed above, and the server may execute analysis softwareto statically (e.g., at edit (or compile) time, or, more generally, notat runtime) analyze the graphical programs and provide feedback to thedevelopers regarding their programs, either singly, or collectively. Forexample, the server may determine all graphical programs (VIs) that usea particular set of graphical program nodes, or may determine andsuggest ways for developers to speed up their code, or otherwiseoptimize the programs, among others. In some embodiments, otherdevelopers or users may contribute to the analysis, and may providedeveloper feedback regarding any of the programs. For example,developers may access programs and/or program execution results on theserver, and post comments or suggestions regarding the programs. Inanother embodiment, program developers may post questions regardingtheir or other programs, and other developers (members of the community)may respond, e.g., after analyzing the programs in question. Thus, invarious embodiments, both automatic and manual static analysis of thegraphical programs may be performed.

FIG. 22—I/O Topologies

FIG. 22 illustrates exemplary I/O topologies wherein a web application,e.g., a program as discussed above, running in an execution sandbox mayaccess hardware through web services, represented by ovals at the tipsof arrows that themselves represent transmission media, e.g., routes,paths, etc. For example, as FIG. 22 shows, the web application, labeled“Browser/App” may utilize web serves to access local hardware, e.g., USBdevices, Bluetooth devices, etc., via an I/O gateway, to access intranetdevices, e.g., Ethernet devices, via a hub, or to access internetdevices, e.g., Ethernet devices, via the Internet (or other WAN). Perthe legend at the bottom right of the figure, the web servicefunctionalities facilitating hardware access are denoted by respectiveovals.

Note that in prior art approaches, when a hardware device or otherresource is being used or accessed by an application, no otherapplications may use or access that device. In contrast, according toembodiments presented herein, multiple browser applications may accessor use the same devices or resources simultaneously, as indicated by thesecond browser/app shown in the right side of FIG. 22.

FIG. 23—I/O Resources Buddy List

Related to the above capability of browser applications accessing andusing hardware resources, FIG. 23 illustrates an exemplary embodiment ofGUI fir displaying such hardware resources, where the GUI is implementedas a “hardware buddy list”, similar to the buddy lists of socialnetworking sites. In one embodiment, a development environment (or someportion thereof) downloaded to the user's client computer may execute inthe web browser to determine and display the hardware buddy list. Thehardware buddy list may display I/O devices for possible use by theuser's programs (e.g., web applications), and may indicate each I/Odevice's status, e.g., whether the device is in use, offline,restarting, fault, pin level, and so forth, among others, based on whichdevices are currently “logged on” to the network.

In various embodiments, further hardware resources, e.g., hardware“buddies”, may be added, e.g., via a hardware gateway application GUI,or through remote administration of a gateway application, among othermethods. Moreover, in some embodiments, such a hardware gateway mayimplement or participate with instant messaging type services.

FIG. 24—Execution Topologies

FIG. 24 illustrates exemplary execution topologies wherein a webapplication, e.g., a program as discussed above, running in an executionsandbox (possibly implemented via a plugin) may be deployed to and mayexecute on various hardware devices through web services, represented byovals at the tips of arrows representing transmission media, e.g.,routes, paths, etc., in “virtual machine” environments, as indicated bythe legend. For example, as FIG. 24 shows, the web application, labeled“Browser/App” may utilize web serves to execute on local hardware, e.g.,USB devices, Bluetooth devices, etc., via an I/O gateway, on intranetdevices, e.g., Ethernet devices, via a hub, or on internet devices,e.g., Ethernet devices, via the Internet (or other WAN).

FIG. 25—Web-Based Program Development

FIG. 25 illustrates an exemplary development system and cycle, where thedeveloper, e.g., a Web LabVIEW developer, builds programs, e.g.,graphical data flow programs (e.g., VIs) in a web based IDE, withinwhich the programs can be create/edited, and possibly tested. Anexemplary IDE is shown in the top left portion of FIG. 25. As indicated,once the developer has developed the program or project (in thedevelopers web browser), the developer may publish the program, e.g., toa web server accessible to others. As also indicated, in someembodiments, a user that has examined or otherwise used the publishedprogram may (under certain circumstances, e.g., with the appropriatepermissions) open a corresponding project and edit the program, afterwhich the edited program may be published, and so forth, in an iterativemanner. See, for example, embodiments described above with respect tothe graphical program repository of FIG. 12. Note that version controlmay be utilized to retain previous versions of the programs.

In some embodiments, once a project has been published, other users mayembed the user interface of the program in other web pages. Thus, peoplethat visit these web pages may see the user/web content with theprogram's GUI (e.g., front panel) embedded. The embedded program maybegin running when the containing web page is loaded, or may startrunning in response to user input, e.g., when a button on the page ispressed (e.g., “A”), among other initiation means. In some embodiments,controls or GUI panels may also contain a link (e.g., “B”) that may takeusers directly to the original project, e.g., stored in a repository, oron the developer's computer. If the link is followed (for example, byclicking on it in the browser) then the project may be loadedimmediately, allowing new users to see how the program was implemented,make their own copy of it and modify it, etc. without the need toinstall a specific development tool.

FIG. 26—Smart Hardware

FIG. 26 illustrates utilization of resources by a web applicationwithout requiring the Internet (or other WAN). More specifically, auser's machine, e.g., a client computer, may communicate with hardwarevia a web server that provides I/O web service, here denoted by ahexagon, and labeled accordingly. The web server may also serve contentthat implements a web-hosted IDE or portion of such an IDE, as describedin detail above. Thus, in one embodiment, an IDE, such as Web LabVIEW™,may provide authoring tool for panels (e.g., GUIs) or programsultimately stored directly on embedded Ethernet devices. In anotherembodiment, a “light weight” IDE, e.g., Web LV with a reduced featureset or footprint, may be hosted by the device for diagram configurationof state machines, system diagrams, or perhaps graphical programsthemselves.

Note that in some embodiments, the hardware may be an embedded device,e.g., running a real time operating system (RTOS), as also indicated inFIG. 26. The exemplary device shown includes a chassis and multiplemodules, e.g., for providing industrial functionality such asmeasurement, automation, control, or analysis, among others. Thus, agraphical program executing on a client computer may use, communicatewith, or otherwise invoke functionality of hardware (including softwareexecuting on the device) coupled to the client computer.

FIG. 27—Hardware and Simulations

FIG. 27 illustrates utilization of a “hardware” resource by a webapplication, e.g., a graphical program per embodiments disclosed herein,where the “hardware” may be actual hardware, or a simulation of suchhardware, via a web server that provides I/O web services, again,denoted here by hexagons. As indicated in FIG. 27, a user's machine,e.g., a client computer, executing the web application (represented bythe graphical program on the left side of FIG. 27), may communicate withor utilize a hardware device via an embedded web server executing on thedevice, or may communicate with or utilize a simulation of the hardwaredevice via an a web server executing on a networked computer system,e.g., a simulation server computer.

As also indicated in FIG. 27, in some embodiments, once the user hastested the web application with the simulation, the user may be providedthe opportunity to purchase the actual hardware corresponding to thesimulated device, e.g., via a “buy” option, as shown.

Further Concepts:

The below describes additional ideas related to embodiments of the abovesystems and methods particularly directed to LabVIEW-basedimplementations. It should be noted that these implementations areintended to be exemplary only, and are not intended to limit theinventions to any particular platform, programming language, orprogramming paradigm.

Device Based Web LabVIEW

Device based LabVIEW may be a version of LabVIEW accessible from abrowser and served from a web server embedded in an embedded device,e.g., somewhat similar to configurations pages on a Ethernet router,except that it refers to a more general IDE for program development. Forexample, in one embodiment, the embedded web content supplied with thedevice may include the Web LabVIEW and quick-start sample applications,e.g., tuned to ensure success with that specific hardware. The sourcefor the sample applications may be loaded in Web LabVIEW for users totry out or to modify.

Internet Based Web LabVIEW

Internet Web LabVIEW may use the same browser hosted graphical programeditor as the device based version, but may be hosted from a server,e.g., ni.com, not an embedded device, and may include all the standardsocial networking elements of a web community, such as, for example,sharing projects, making copies, tracking usage, commenting, and soforth.

The graphical program (e.g., VI) may be compiled within the browserapplication directly, or may be saved to the server (embedded orInternet), where a web service may perform the compilation and returnthe results for execution in the browser. The compiled result of theprogram (compiled in the browser or by the server) may also be deployedto execute on targets other than the original browser, e.g., embeddeddevices, cloud computing hosts, web servers, and so forth.

As indicated above, in some embodiments, the graphical program may beexecuted by an interpreter, and so a compiler or separate compilationstep may not be required.

Creation of a Graphical Program

The following describes various exemplary ways and means for creating agraphical program.

The graphical program may be created or assembled by the user arrangingon a display a plurality of nodes or icons (e.g., by dragging anddropping the nodes or icons onto a block diagram) and theninterconnecting the nodes to create the graphical program. In responseto the user assembling the graphical program, data structures may becreated and stored which represent the graphical program. The nodes maybe interconnected in one or more of a data flow, control flow, orexecution flow format. The graphical program may thus comprise aplurality of interconnected nodes or icons which visually indicates thefunctionality of the program. As noted above, the graphical program maycomprise a block diagram and may also include a user interface portionor front panel portion. Where the graphical program includes a userinterface portion, the user may optionally assemble the user interfaceon the display. As one example, the user may use the LabVIEW graphicalprogramming development environment to create the graphical program.

In an alternate embodiment, the graphical program may be created by theuser creating or specifying a prototype, followed by automatic orprogrammatic creation of the graphical program from the prototype. Thisfunctionality is described in U.S. patent application Ser. No.09/587,682 titled “System and Method for Automatically Generating aGraphical Program to Perform an Image Processing Algorithm”, which ishereby incorporated by reference in its entirety as though fully andcompletely set forth herein. The graphical program may be created inother manners, either by the user or programmatically, as desired. Thegraphical program may implement a measurement function that is desiredto be performed by the instrument. In other embodiments, the graphicalprogram may be generated automatically, or received from an externalsource.

In a more specific embodiment, a graphical user interface or front panelfor the graphical program may be created, e.g., in response to userinput. The graphical user interface may be created in any of variousways, e.g., depending on the graphical programming developmentenvironment used. A block diagram for the graphical program may becreated. The block diagram may be created in or using any graphicalprogramming development environment, such as LabVIEW, Simulink, VEE, oranother graphical programming development environment. The block diagrammay be created and edited in response to direct user input, e.g., theuser may create the block diagram by placing or “dragging and dropping”icons or nodes on the display and interconnecting the nodes in a desiredfashion. Alternatively, the block diagram may be programmaticallycreated from a program specification. The plurality of nodes in theblock diagram may be interconnected to visually indicate functionalityof the graphical program. The block diagram may have one or more of dataflow, control flow, and/or execution flow representations.

It is noted that the graphical user interface and the block diagram maybe created separately or together, in various orders, or in aninterleaved manner. In one embodiment, the user interface elements inthe graphical user interface or front panel may be specified or created,and terminals corresponding to the user interface elements may appear inthe block diagram in response. For example, when the user places userinterface elements in the graphical user interface or front panel,corresponding terminals may appear in the block diagram as nodes thatmay be connected to other nodes in the block diagram, e.g., to provideinput to and/or display output from other nodes in the block diagram. Inanother embodiment, the user interface elements may be created inresponse to the block diagram. For example, the user may create theblock diagram, where the block diagram includes terminal icons or nodesthat indicate respective user interface elements. The graphical userinterface or front panel may then be automatically (or manually) createdbased on the terminal icons or nodes in the block diagram. As anotherexample, the graphical user interface elements may be comprised in thediagram.

Although the embodiments above have been described in considerabledetail, numerous variations and modifications will become apparent tothose skilled in the art once the above disclosure is fully appreciated.It is intended that the following claims be interpreted to embrace allsuch variations and modifications.

I claim:
 1. A non-transitory computer-accessible memory medium thatstores: a plurality of graphical data flow programs (GDFPs), whereineach GDFP comprises a respective plurality of interconnected nodes whichvisually indicate the functionality of the program, and is accessibleand useable via web browsers executing on client computers, and whereinthe GDFPs are in accordance with a data flow model of computation inwhich program functions execute whenever their necessary input data areavailable; a graphical data flow program execution engine (GDFPexecution engine), wherein the GDFPs require the GDFP execution engineto execute; and program instructions executable by a processor to:establish a network connection with a client computer over a network;receive a universal resource identifier (URI) from the client computerover the network, wherein the URI indicates a GDFP of the plurality ofGDFPs; send the GDFP and the GDFP execution engine to the clientcomputer over the network in response to the URI, wherein the GDFPexecution engine is entirely executable in a web browser on the clientcomputer to: execute the GDFP entirely in the web browser on the clientcomputer in accordance with the data flow model of computation via theGDFP execution engine, including executing program functions of the GDFPwhenever their required input data are available, wherein the GDFPexecution engine displays a front panel in the web browser duringexecution of the GDFP, wherein the front panel comprises a graphicaluser interface (GUI) comprising one or more output indicators fordisplaying results of the GDFP execution, and/or one or more inputcontrols for receiving user input specifying input to the GDFP; andassess a charge for use of the GDFP on the client computer.
 2. Thenon-transitory computer-accessible memory medium of claim 1, wherein theGDFP execution engine comprises an interpreter, and wherein to executethe GDFP entirely in the web browser, the GDFP execution engine isexecutable to interpret the GDFP in the web browser.
 3. Thenon-transitory computer-accessible memory medium of claim 1, wherein toassess a charge for use of the GDFP on the client computer, the programinstructions are executable to assess the charge in accordance with aspecified use plan.
 4. The non-transitory computer-accessible memorymedium of claim 3, wherein the specified use plan comprises asubscription to one or more levels of service, wherein each level ofservice specifies one or more of: GDFPs available to users at that levelof service; or conditions of use of GDFPs available to users at thatlevel of service.
 5. The non-transitory computer-accessible memorymedium of claim 3, wherein the specified use plan comprises a pay peruse plan.
 6. The non-transitory computer-accessible memory medium ofclaim 5, wherein the pay per use plan specifies one or more of:time-metered use of the GDFP; or use-metered use of the GDFP.
 7. Thenon-transitory computer-accessible memory medium of claim 6, and whereinthe GDFP and the GDFP execution engine are automatically deleted fromthe client computer after use in accordance with the specified use plan.8. The non-transitory computer-accessible memory medium of claim 3,wherein the program instructions are further executable to: receive anindication of the specified use plan from the client computer over thenetwork; and store information specifying the specified use plan for auser of the client computer.
 9. The non-transitory computer-accessiblememory medium of claim 1, wherein the plurality of GDFPs comprise ameasurement application, wherein the measurement application isexecutable in the web browser on the client computer to perform aspecified measurement function.
 10. The non-transitorycomputer-accessible memory medium of claim 1, wherein the plurality ofGDFPs comprise one or more of: an automation application; or a controlapplication.
 11. The non-transitory computer-accessible memory medium ofclaim 1, wherein the GDFP comprises a model of a device, wherein theGDFP execution engine is further executable in the web browser to:present an offer to sell the device; receive user input specifyingpurchase of the device; and send an indication of the purchase of thedevice over the network.
 12. The non-transitory computer-accessiblememory medium of claim 11, wherein the program instructions are furtherexecutable to: receive the indication of the purchase of the device fromthe client computer over the network; wherein to assess the charge foruse of the GDFP on the client computer, the program instructions arefurther executable to: assess a charge for the device.
 13. Thenon-transitory computer-accessible memory medium of claim 1, wherein thespecified use plan specifies and permits downloading and using one ormore software tools for use with the GDFP, wherein the one or moresoftware tools comprise one or more of: a GDFP editor; a GDFP staticanalyzer; a GDFP dynamic analyzer; a GDFP compiler; or a GDFPinteractive development environment (IDE); and wherein the programinstructions are further executable to send at least one software toolof the one or more software tools to the client computer over thenetwork, where the at least one software tool is entirely executable inthe web browser on the client computer to perform one or more functionswith respect to the GDFP.
 14. The non-transitory computer-accessiblememory medium of claim 1, wherein the program instructions are furtherexecutable to: send an indication of the assessed charge to a user ofthe GDFP, or a representative of the user.
 15. The non-transitorycomputer-accessible memory medium of claim 1, wherein the programinstructions are further executable to: bill an account associated withthe user in accordance with the assessed charge; or send a bill for theassessed charge to the user of the GDFP, or a representative of theuser.
 16. The non-transitory computer-accessible memory medium of claim1, wherein the program instructions are further executable to: receivepayment for the assessed charge.
 17. The non-transitorycomputer-accessible memory medium of claim 1, wherein to receive paymentfor the assessed charge, the program instructions are executable to:receive credit card information from the client computer over thenetwork; and bill the assessed charge to the credit card.
 18. Thenon-transitory computer-accessible memory medium of claim 1, wherein theGDFP is configured to execute in a sandbox, wherein the sandboxcomprises a secure execution environment for the GDFP, and wherein theGDFP being entirely executable in the web browser comprises the GDFPbeing executable in the sandbox.
 19. The non-transitorycomputer-accessible memory medium of claim 18, wherein the sandbox isimplemented by a plugin, wherein GDFP being executable in the sandboxcomprises the GDFP being executable in the plugin.
 20. Acomputer-implemented method, comprising utilizing a computer to perform:storing a plurality of graphical data flow programs (GDFPs), whereineach GDFP comprises a respective plurality of interconnected nodes whichvisually indicate the functionality of the program, and is accessibleand useable via web browsers executing on client computers, and whereinthe GDFPs are in accordance with a data flow programming protocol inwhich program functions execute whenever their necessary input data areavailable; storing a graphical data flow program execution engine (GDFPexecution engine), wherein the GDFPs require the GDFP execution engineto execute; establishing a network connection with a client computerover a network; receiving a universal resource identifier (URI) from theclient computer over the network, wherein the URI indicates a GDFP ofthe plurality of GDFPs; sending the GDFP and the GDFP execution engineto the client computer over the network in response to the URI, whereinthe GDFP execution engine is entirely executable in a web browser on theclient computer to: execute the GDFP entirely in the web browser on theclient computer in accordance with the data flow model of computationvia the GDFP execution engine, including executing program functions ofthe GDFP whenever their required input data are available, wherein theGDFP execution engine displays a front panel in the web browser duringexecution of the GDFP, wherein the front panel comprises a graphicaluser interface (GUI) comprising one or more output indicators fordisplaying results of the GDFP execution, and/or one or more inputcontrols for receiving user input specifying input to the GDFP; andassessing a charge for use of the GDFP on the client computer.
 21. Anon-transitory computer-accessible memory medium that stores programinstructions executable by a processor of a client computer to:establish a network connection with a server computer over a network,wherein the server computer stores: a plurality of graphical data flowprograms (GDFPs), wherein each GDFP comprises a respective plurality ofinterconnected nodes which visually indicate the functionality of theprogram, and is accessible and useable via web browsers executing onclient computers, and wherein the GDFPs are in accordance with a dataflow model of computation in which program functions execute whenevertheir necessary input data are available; and a graphical data flowprogram execution engine (GDFP execution engine), wherein the GDFPsrequire the GDFP execution engine to execute; send a universal resourceidentifier (URI) to the server computer over the network, wherein theURI indicates a GDFP of the plurality of GDFPs; receive the GDFP and theGDFP execution engine from the server over the network in response tothe URI; execute the GDFP entirely in a web browser on the clientcomputer in accordance with the data flow model of computation via theGDFP execution engine, including executing program functions of the GDFPwhenever their required input data are available, wherein the GDFPexecution engine displays a front panel in the web browser duringexecution of the GDFP, wherein the front panel comprises a graphicaluser interface (GUI) comprising one or more output indicators fordisplaying results of the GDFP execution, and/or one or more inputcontrols for receiving user input specifying input to the GDFP; andreceive an indication of an assessed charge for use of the GDFP from theserver computer over the network.
 22. A computer-implemented method,comprising utilizing a client computer to perform: establishing anetwork connection with a server computer over a network, wherein theserver computer stores: a plurality of graphical data flow programs(GDFPs), wherein each GDFP comprises a respective plurality ofinterconnected nodes which visually indicate the functionality of theprogram, and is accessible and useable via web browsers executing onclient computers, and wherein the GDFPs are in accordance with a dataflow model of computation in which program functions execute whenevertheir necessary input data are available; and a graphical data flowprogram execution engine (GDFP execution engine), wherein the GDFPsrequire the GDFP execution engine to execute; sending a universalresource identifier (URI) to the server computer over the network,wherein the URI indicates a GDFP of the plurality of GDFPs; receivingthe GDFP and the GDFP execution engine from the server over the networkin response to the URI; executing the GDFP entirely in a web browser onthe client computer in accordance with the data flow model ofcomputation via the GDFP execution engine, including executing programfunctions of the GDFP whenever their required input data are available,wherein said executing the GDFP comprises displaying a front panel inthe web browser during, wherein the front panel comprises a graphicaluser interface (GUI) comprising one or more output indicators fordisplaying results of the GDFP execution, and/or one or more inputcontrols for receiving user input specifying input to the GDFP; andreceiving an indication of an assessed charge for use of the GDFP fromthe server computer over the network.
 23. A non-transitorycomputer-accessible memory medium that stores: a graphical data flowprogram (GDFP), comprising a plurality of interconnected nodes whichvisually indicate the functionality of the program, wherein the GDFP isaccessible and useable via web browsers executing on client computers,and wherein the GDFP is in accordance with a data flow model ofcomputation in which program functions execute whenever their necessaryinput data are available; a graphical data flow program execution engine(GDFP execution engine), wherein the GDFP requires the GDFP executionengine to execute; and program instructions executable by a processorto: establish a network connection with a client computer over anetwork; receive a universal resource identifier (URI) from the clientcomputer over the network, wherein the URI indicates the GDFP; send theGDFP and the GDFP execution engine to the client computer over thenetwork in response to the URI, wherein the GDFP execution engine isentirely executable in a web browser on the client computer to: executethe GDFP entirely in the web browser on the client computer inaccordance with the data flow model of computation via the GDFPexecution engine, including executing program functions of the GDFPwhenever their required input data are available, wherein the GDFPexecution engine displays a front panel in the web browser duringexecution of the GDFP, wherein the front panel comprises a graphicaluser interface (GUI) comprising one or more output indicators fordisplaying results of the GDFP execution, and/or one or more inputcontrols for receiving user input specifying input to the GDFP; andassess a charge for use of the GDFP on the client computer.
 24. Acomputer-implemented method, comprising utilizing a computer to perform:storing a graphical data flow program (GDFP), comprising a plurality ofinterconnected nodes or icons which visually indicate the functionalityof the program, wherein the GDFP is accessible and useable via webbrowsers executing on client computers, and wherein the GDFP is inaccordance with a data flow model of computation in which programfunctions execute whenever their necessary input data are available;storing a graphical data flow program execution engine (GDFP executionengine), wherein the GDFP requires the GDFP execution engine to execute;establishing a network connection with a client computer over a network;receiving a universal resource identifier (URI) from the client computerover the network, wherein the URI indicates the GDFP; sending the GDFPand the GDFP execution engine to the client computer over the network inresponse to the URI, wherein the GDFP execution engine is entirelyexecutable in a web browser on the client computer to: execute the GDFPentirely in the web browser on the client computer in accordance withthe data flow model of computation via the GDFP execution engine,including executing program functions of the GDFP whenever theirrequired input data are available, wherein the GDFP execution enginedisplays a front panel in the web browser during execution of the GDFP,wherein the front panel comprises a graphical user interface (GUI)comprising one or more output indicators for displaying results of theGDFP execution, and/or one or more input controls for receiving userinput specifying input to the GDFP; and assessing a charge for use ofthe GDFP on the client computer.